This is the cbs evening news with scott pelley. Pelley good evening. Just a day after canada raised its Terror Threat level air terrifying scene unfolded in its capital today. Police say a canadianborn person opened fire in the Parliament Building in ottawa after gunning down a soldier standing watch at the nearby National War Memorial. The soldier was 24yearold nathan cirillo, seen in a photo taken by a tourist this past sunday. Motive for the attack is not clear. We do not know yet whether the gunman had any ties to any terrorist group. We have extensive coverage of this stilldeveloping story. First well go to jim axelrod in ottawa. Reporter the halls of parliament exploded with gunfire after Security Forces spotted the suspected shooter. Kevin vickers, the sergeant at arms, shot and killed the gunman. Vickers has a ceremonial role but is also a former Police Officer. Prime minister steven harper, whose office is nearby, was canadian politician john mckay was inside. I had just taken off my jacket to go to caucus, i heard pop, pop pop pop. I thought it was dynamite or construction rather than anything else. Reporter politician were holdings caucus meetings and doors were barricaded for protection. Politician kyle seeback tweeted the attack started at the National War Memorial in downtown ottawa. Police confirmed the suspect drove up in a brun toyota and shot the soldier standing guard at pointblank range way long rifle. And all of a sudden, i heard a shot, turned around and there was a guy with a rifle just around on the back corner and just pow. Reporter multiple eyewitnesses described the man as dressed in black with a scarf over his face. Onlookers performed cpr but the soldier later died. Police rushed to secure the area and warned people to clear the streets. Move back reporter it was unclear how many gunmen could be involved. Residents were told to stay away from windows and off roofs. And much of downtown ottawa was on lockdown. Reports of shots outside a nearby Shopping Mall turned out not to be true. But fears this could be a coordinated terrorist attack left the city on edge. Two days ago a radical jihadist deliberately ran down two canadian soldiers, oneerday. The suspect was shot and killed following a police chase. The sergeant at arms who shot and killed the gunman today is being hailed as a National Hero tonigh more about kevin vickers. You can see him here in a Photo Holding the mace and performing his ceremonial duties. But he is also the man in charge of security for parliament, a job hes held for the last eight years. Before that he was a Royal Canadian mounted Police Officer for 29 years. And interestingly enough, mr. Vickers has been a vocal critic of this governments approach to security on parliament hill. Scott, you can bet his views will be taken quite seriously that security is insufficient up there after todays events. Pelley and still no word on whether the killing on monday is related to todays events. Jim axelrod in ottawa, thanks. Covering this story all day long has been peter mansbridge, the anchor and chief correspondent for canadian broadcasting. People, how does this strike canadians . Well, i think scott, this is the day that kind of changes everything in terms of the way canadians look at the issue of homegrown terror. I mean think about it this way if a gunman walked into Arlington National cemetery, went to the tomb of the unknown and shot one of those guards standing guard over the tomb, then went into the Capitol Building and got in a shootout with guards there, thats what happened here went into the kind of soul of our remembrance or tomb of the unknown the National War Memorial. Then went into the heart of our democracy, the Parliament Building, and got involved in a shootout there. You have these two incidents happening in quick succession over a matter of minutes on this day, two days after there had been an incident attacking soldiers in quebec. I put these two together, this is the day that if anyone had any doubt that this wasnt an issue, today that doubt has been erased. Pelley one of the things canadianscanadians are proud of is the essentially wideopen nature of parliament hill. Is that over now . Youd have to think its going to change. There are going to be many questions about how somebody with a largesized rifle could run the you know, about 60 seconds to two minute across one of the most secure areas in the sense that there are lots of Security Forces stationed on the Parliament Buildings grounds and get right into the Parliament Buildings and then heading up, you know it was some time before they stopped him. Pelley this is a new kind of event for canada, and i wonder if you could give us a sense in these early hours of the national mood. A lot of people coast to coast to coast are obviously, in shock because of this. We have people crying in the streets on the west coast on Vancouver Island at this news. Because it strikes so close to home in the sense of two Major National symbols where Something Like this has occurred, and people just said, you know, this is canada. This doesnt happy in canada. Well today it happened in canada, and the consequences goinged for now are still to be determined. Pelley peter mansbridge, chief correspondent and anchor of the cbc, thank you so much. After the attack today norarkd the north American Aerospace Defense Command went on a heightened state of alert and since canadas National War Memorial was a target, security was beefed up at Arlington National cemetery in virginia. Here is what president obama had to say today. Obviously were all shaken by it, but were going to do everything we can to make sure that were standing side by side with canada during this difficult time. Pelley also in washington, our Homeland Security correspondent bob orr is following the investigation. Bob, what do you know . Reporter scott, Law Enforcement source tell us there is no intelligence at this point suggesting the shootings today in ottawa are connected in any way to a broader plot or to any threat against the u. S. Homeland. The f. B. I. And intelligence agencies, of course, are in touch with theirica nairnt counterparts and are all looking to pin down a motive for the shootings. Were told some of the evidence suggests the attack may have some kind of domestic link, but investigators have not ruled out at the same time the possibility, the real possibility that the gunman may have been inspired by terrorists. Terror groups have called on sympathizers to attack soldiers, police and other western targets, essentially whenever and wherever possible and in fact its already happened. That deliberate hit and run that killed the canadian soldier near montreal earlier in the week was clearly a terrorist act carried out by one radicalized man who struck out on behalf of isis. With u. S. Airstrikes continuing now against Islamic State targets in iraq and syria the f. B. I. And the department of Homeland Security are out warning local police to be on guard, potentially for more retaliatory attacks by a lone wolves attacks scott that look very much like what weve already seen in canada. Pelley bob orr in our washington newsroom. Thank you, bob. In another big story today an investigation of academic fraud at the university of North Carolina has found that it was much more widespread than first thought. Turns out more than 3,000 students, nearly half of them athletes, were enrolled in classes that did not exist and got credit just the same. We have more now from mark strassmann. There you have it. North carolina is the 1993 national champion. Reporter in 1993, when the university of North Carolinas Basketball Team became National Champs investigators say academic fraud was also in play. A report released today says Deborah Crowder an Office Administrator in the department of african and afroamerican studies, started a scheme to enroll students in classes that never met and had only one minimal requirement they didnt take notes have to stay weak. They didnt have to meet with professors. And the only course work they had to do was write a single paper. Reporter kenneth wainstein, a former u. S. Attorney, was hired by the university to lead the investigation. Deborah crowder graded the papers and handed out liberally high grades regardless of the quality of papers. Reporter investigators say the Department Chairman julius nyungoro was also in on the scam which kept hundreds of athletes academically eligible to play. Its estimated more than 1400 athletes benefitted, but their head coaches say they had no idea. The scam ended ended in 2011 when julius nyungoro stepped down under pressure. Carole folt says four employees have been fired in this continuing investigation. How many others potentially could fall under an employee review . You know, i actually dont know a number. Reporter but the number potentially could grow. It could groark yeah. It also could be the more we look, the more we find people really werent culpable, but then we also know we have to do a heck of a lot better training about responsibility. Reporter crowder and julius nyungoro both cooperated with the investigation which reviewed more than one million emails and documents. Among the reforms on this campus more oversight of academic departments and student athlete transcripts. And, scott coaches have been told they need to pay more attention. Pelley and the really remarkable thing is it went on for nearly 20 years. Mark strassmann reporting. Mark, thank you. Today, the c. D. C. Issued new rules for people coming into the United States from the ebola zone in west africa. Starting monday, all travelers will be monitored for 21 days for symptoms of the virus. President obama said that he is cautiously optimistic about the ebola situation after meeting today with the new Ebola Response coordinator ron klain. And the family of dallas nurse amber vinson says she is now virus free. Vinson is beingt emory hospital in atlanta. A federal jury in washington returned guilty verdicts today against four blackwater security guards. They were charged in the 2007 shootings of more than 30 unarmed iraqis in baghdad. 17 of them died, including a nineyearold boy. One guard was convicted of first degree murder, the others voluntary manslaughter. The men claimed that they were under attack. Our Elizabeth Palmer was in the iraqi capital at that time, and she spoke to a man who tells a very different story. Reporter hasan jaber an iraqi lawyer, survived the hail of blackwater bullets in the square, but only just. Once he recovered from surgery he came to our Baghdad Office to show us where one of the bullets had gone right through him. Jaber, like all the iraqi witnesses, denied blackwaters claim that its convoy had been shot at first. Ali khalaf was the traffic cop on duty that day. Not only did no one fire at them, he said, no one even approached them. And he pointed out that all the spent shells were from american guns. By 2007, blackwater had been in iraq for four years on contract to provide security for the state department. But partly due to leaked videos like this one the contractors had earned a reputation as arrogant trigger help happy cowboys with no regard for iraqi life. The shootings in Nisour Square set off furious antiamerican demonstrations and marked a turning point. And after the u. S. Government paid compensation to victims, the company lost its state department contract. But as a traumatized hasan jaber asked at the time, so many blackwater guards fired on innocent civilians that day. Why did only four ooefer have to face justice . Elizabeth palmer, cbs news london. Pelley an american held captive in north korea for nearly six months is back on u. S. Soil tonight. He was reunited with his family after a plane carrying him landed at an airbase near dayton ohio. Foal, who visited the communist country on a tourist visa, was arrested last may after leaving aifiable in a nightclub. Those defective airbags linked to a number of deaths are now subject of a criminal investigation. And hungry bears forge for porridge or anything edible. Its no fairy tale when the cbs evening news continues. Feet. I learned where the stress was at the dr. Scholls foot mapping center. Then i got my number, which matched the custom fit orthotic inserts with the right support. 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Also today the wall street journal reported that the japanese maker of the defective airbags, takata, is being targeted by federal prosecutors. Heres jeff glor. Reporter it seemed to be a minor accident in florida involving a 2006 dodge charger. But when the airbag went off it exploded sending shrapnel into the drivers leg. The car had a takata airbag, but the vehicle is not on a recall list. Jason turchin represented the victim. The only difference between this peelsz of shrapnel shooting him in the leg and the heart was inches. Reporter flying metal from takata airbags has been linked to at least four deaths and 30 industries. The airbags contain a canister filled with a chemical propellent. So farb the recalls have mostly been in Southern States because takata believes humidity increases the force of the propellant. The national Highway Traffic Safety Administration was first alerted to this problem in 2008, and now a growing chorus of legislators is asking why more isnt being done. Florida senator bill nelson. I have no patience for federal regulators not being entirely upfront,ed for leaning and aggressive to stop these defective products. Reporter chrysler settled that case in florida and told us tonight theyre investigating the performance of certain airbag inflators. Takata told us previously one accident is one too many. But, scott no new statement from takata tonight. Pelley many more than one. Jeff, thank you very much for that. For more about the airbags and the recall go to our web site. Youll find it at cbsnews. Com. Millions people on Social Security will be get be a raise. Well tell you about that next. Pelley the way the story goes, a young man boarded a train to baltimore to look for a job but it was raining there so he stayed on the train to washington and landed work at the washington post. His name was ben bradlee, and the rest is history, much of it chronicled by the paper that he would run. Bradlee oversaw the pulitzer prizewinning coverage of watergate. His policy as executive editor was to hire good reporters and trust them to do their jobs. Healthy skepticism didnt hurt. He told 60 minutes, i just do not believe the first version of events in this city. Ben bradlee awarded the nations highest civilian honor the president ial medal of freedom, died yesterday. He was 93. Americans on Social Security will get a raise the first half of next year. The cost of living adjustment will amount to 1. 7 or about 22 a month for the average recipient. For those paying into Social Security the maximum wages subject to the payroll tax will rise to 118,500. And today, an artifact of the digital revolution was sold at auction. This apple 1 computer was built by steve woes meac in steve jobs garage in loss altos california, back in 1976. New, they cost 666. But this relic sold today for 905,000. Still ahead tonight thats a big bear. Thats a big bear, yeah. Pelley the real bad news bears. Shes still the one for you. And cialis for daily use helps you be Ready Anytime the moment is right. Cialis is also the only daily ed tablet approved to treat symptoms of bph like needing to go frequently. Tell your doctor about all your medical conditions and medicines, and ask if your heart is healthy enough for sex. Do not take cialis if you take nitrates for chest pain as it may cause an unsafe drop in blood pressure. Do not drink alcohol in excess. Side effects may include headache, upset stomach, delayed backache or muscle ache. To avoid long term injury, get medical help right away for an erection lasting more than four hours. 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Experience the meta effect with our new multihealth wellness line and see how one small change can lead to good things. Coming up on your only local news at 7 00. A substitute teacher at pelley in ashland oregon, a bear got into a drugstore. He first checked out the greeting cards and then moved on, perhaps in search of bear aspirin. Bears are causing a lot of headaches for people in reno, nevada and carter evans is there. Reporter police are after a prowler in this reno neighborhood and carl lackey knows just how to track him down. He looked like a 300 400pounder. Thats a big bear. Thats a big bear. Lack sea bear biologist for the Nevada Department of wildlife. So far this year, his team has documented and tagged 108 black bears, nearly a record. Most were captured in unfamiliar territory. The extreme drought has not only dried up rivers. Its also depleted the bears natural food sources forcing them father into urban communities to feed. Does this look like something a bear would do . Yeah, this is pretty typical bear sushi. Reporter bears are bulking up for hibernation right now and they need to eat up to 30,000 calories a day the equivalent of more than 100 cheeseburgers. There is better habitat down here in these neighborhoods than what the bears can find up there in the forest. Everybodys got fruit trees, a lot of urban ponds. Its a food buffet for a bear. Reporter this is a bear paw print . Thats exactly right. Reporter liz kern says at least three bears have climbed into her backyard this month. This one was caught after eating the fish in her pond. Are you concerned because the bears have come here and found food that they might return . Absolute. Theyre starving right now. Theyre looking for food. And i dont know if were going to be the next casualties. Reporter nearby in lake tahoe, hungry bears have been even more invasive, breaking and entering to raid the kitchen. So these are scratches from the bear claws . Yeah. And it just yanked it right open. Yeah. Reporter a bear pried open bryce betterlys door and smashed his car window. Its been back twice. Its definitely nerveracking. Theres a sense of security that i think everybody has and i kind of lost that. Reporter Animal Rights activist ann bryant says black bears rarely attack people. Theyre just following their keen sense of smell. They are always on a search for food and if we can provide an easy way for them to get that food, theyre going to do it. Reporter if these animals are just acting on instinct, people may ultimately bear the responsibility. Carter evans, cbs news, reno. Pelley and thats the cbs evening news for tonight. For all of us at cbs news all around the world, good night. Captioning sponsored by cbs searchers from Virginia State police leaving no leaf, no stone, no area unturned as we wait to find out if the remains found over the weekend were those of hannah graham. Reporter this is bruce johnson. Weve got an exclusive interview from the ambassador from liberia talking about the devastation caused by ebola in his country and steps taken here to keep ebola out of the United States. Reporter which candidate would build more schools . Im bruce leshan in battleground, montgomery where the candidates are trading charges over School Construction and school breakfast. Good evening. Im jan jeffcoat. And im derek mcginty. Leading our newscast tonight, the arrest of a 22 yearold substitute teacher at a d. C. Charter school accused of performing a sex act on a 17 yearold student. The school for at risk students, where the teen taped the encounter and shared it with students on his football team. Reporter im Stephanie Ramirez outside d. C. Superior court where a judge arraigned 22yearold Symone Greene on a charge of sex abuse of a minor. She was released on her own recognizance due back in court next month, but yesterday she was arrested for performing a sex act on a 17yearold 11th grader she met last friday at Options Public Charter School in northeast d. C. The student assisted as a classroom aide. Police say they flirted via text and engaged in a sexual activity. Police tell us the student recorded this and showed friends. Authorities eventually discovered the video and Text Messages between the two where greene admits what they are doing is wrong and encourages the student not to tell anyone. A neighbor whose granddaughter graduated from options public says shes glad nothing like this happened while her granddaughter went to the school