and good morning. we begin this tuesday with the latest details on that mass shooting at the washington navy yard. >> the motive for the shootings still unknown. the facility remains open this morning with only essential personnel reporting for work. here's the very latest. 13 people including the lone gunman are dead. eight victims are hurt. we're learning that he used security clearance to enter that building with a rifle and a handgun. our coverage begins with abc's tahman bradley near the navy yard in washington. tahman? >> reporter: good morning. the navy yard reopens today for essential personnel, as authorities continue searching for clues about the suspect. overnight, we learned that the suspect may have had a grudge against the navy. the fbi says 34-year-old aaron alexis is behind the terror at the washington navy yard. >> we have an active shooter on the fourth floor. >> reporter: 12 people were killed and 8 injured before alexis died at the hands of police. >> we have the single and sole person responsible for the loss of life. >> this morning, authorities are urgently seeking the public health about aaron alexis. >> we're learning as much as we can about his recent movements, contacts and associates. >> reporter: overnight in brooklyn, the authorities questioned the suspect's family as they continue to search for a motive. alexis had a valid security clearance that had him access building 197. the horror started as the work day began. >> he came around the corner. and he fired two or three shots. >> he raised and aimed at us. and he hit high on the wall. >> reporter: the navy yard stayed on lockdown for more than six hours. the horrifying attacks felt across washington. the faa halted all flights out of reagan national airport. the suspect had a history of disturbing behavior. he was arrested in 2010, accused of recklessly discharging a firearm into a neighbor's apartment. and in 2005, hi confessed to shooting out tires of another man's car. overnight, some families were still awaiting word from their loved ones. the victims range 46 to 73, all survivalians. >> tahman bradley in washington for us. thank you. overnight, we've learned the names of some of those killed at the navy yard. 7 of the 12 victims including 59-year-old michael armed. 53-year-old silvia frasier. kathy gaarde. john roger johnson. frank kohler. vishnu pandit. and kenneth bernard proctor. and the rest of the victims are being withheld until the families can be notified. there's a key question that remains. who is aaron alexis? >> profilers will be talking to just about everyone who ever knew him. what the profilers are likely to begin seeing is a study in contradiction. aaron alexis was a convert to buddhism. a friend said he used to meditate with him. >> he's a good guy. what i know. i can't say he did or not. but with me, nothing to be, like, tell me that he's going to be aggressive. no sign that these going to shoot someone. >> reporter: but alexis' father said that his son had anger management problems. he complained about being a victim of discrimination and about the navy. >> he didn't seem like he would be that kind of person to be upset enough to go out and do something like this. >> reporter: alexis worked as a thai restaurant in texas. he traveled to thailand. those who knew him cannot hide their disbelief. >> it's really sad that he's gone already. and that he took 12 other people with him. >> reporter: one thing that is clear, is alexis was not a loner. he had friends. a support network. >> he had car trouble. he asked me for some help. and i helped in every way i could. >> reporter: but alexis was passionate about video games and would stay up all night playing them. >> i didn't want him to get discouraged. you know? but obviously, he got discouraged about something. i just wish i knew what it was. i really do. i wish -- i just wish this had never happened. >> that same friend tells abc news, that alexis used to joke about shooting people while playing violent games. and he started missing work because of his video game habit. >> obviously, something investigators will be looking into on this day-after, still disbelief. the white house says president obama has ordered flags to be lowered to half-staff, honoring the shooting victims. it will remain at half-staff until sunset on friday. >> on capitol hill, a moment of silence. a senate hearing on stand your ground laws has been postponed. and the washington nationals will be made up that game this afternoon. 1:00 p.m. it's part of a split doubleheader. and stay with abc news and abcnews.com as we cover all of the developments in the navy yard shootings. live team coverage coming up on "good morning america." the death toll from the colorado floods has climbed to at least eight. >> rescue efforts is resumed to reach hundreds of people stranded in cutoff towns. and many of those whose lives were spared have lost everything else. marci gonzalez is in boulder, colorado. >> reporter: new images of the continued devastation in colorado. the water carving its way through bridges and roads. isolating houses and entire towns. leaving residents trapped. >> there's about 1,000 residents that are up in the various isolated areas in need of evacuation. >> reporter: rescue crews whose helicopters were grounded by rain sunday, spending the day making their way to places where homes were toppled and swept away. and the mud left its own merciless mark. >> my building is split in half. with huge boulders in it and a tree. that fell between the two parts of the building. so, it's incredible. >> reporter: saving the stranded from towns like lyons, colorado, searching for 400 people statewide, still unaccounted for. >> at this point, mathematical exercise. we don't think the number will be nearly that high. >> reporter: already, more than 11,000 people have been rescued. and with each person so gratefully steps on dry land, that number climbs. but officials so, too, will be death toll. with at least seven lives lost already. and while in so many places, including here in boulder creek, the water is still raging, at least the weather is clearing. finally, after seven days of rain, it stopped. and sunshine is in the forecast for the next few days. marci gonzalez, abc news, boulder, colorado. >> our thanks to marci. there's more breaking news overnight. >> standing call. the crippled cruiseship is upright. we're going to take you to where the mossive salvage operation is under way. sp people dead, following a shooting at the na crews in italy are calling it a perfect ending to an unprecedented feat of engineering. >> the daring operation to get the "costa concordia" from its side. >> pretty amazing stuff. what's next? lama hasan is live in italy with the latest. lama, take us through the past few hours. this moved kind of slowly. didn't happen real quick, did it? >> reporter: no. good morning to you, john. it was an epic and very long 19-hour operation that went on all day yesterday. and well into the night. but "the costa concordia" is upright and where engineers want it to be. resting on six underwater platforms. it took a little longer, as you said, than they had anticipated. first, they were predicting it would take 12 hours. but they had to go slower than they wanted to. you can see, they got there in the end. as you can imagine, the engineers that are working on this, complicated an unprecedented project. it took place on a ship of this magnitude. there were cheers and applause from the hundreds of salvage workers when the ship was vertical. and officials say, there was no apparent solution because that was a worry. there was no apparent solution in the waters around the ship, as a result of the operation. but the project is not over. the work is still going to go on. experts will be working for weeks to patch up the star board side of the vessel, that was underwater, to make sure it is stable. they hope to float the vessel by spring or in the summer next year and take it to a nearby port where they can finally dismantle it. >> we were just looking at video of the time lapse video of what looks like it was going up millimeter by millimeter, it was so slow. what happens now to the ship? all of the belongings inside? 4,000 passengers were in that huge ship. >> reporter: exactly. that's a very good point. look, there is still fuel, cleaning fluids and paint onboard. there's freezers full of food which have now been badly decomposed. they will have to start the cleanup operation. also onboard, the bags and personal belongings of the 4,000 passengers. and those in charge of the project say they hope they can return them to their rightful owners. 20 months after "the costa con dord ya" went down. >> it's like the project is just getting started. thank you so very much this morning. when we come back, growing outcry. unmanned -- unarmed man shot by police, ten times. and this morning, you're going to hear from his mother, who is demanding justice. and battle against superbugs. health officials are sounding the alarm about the growing number of drug-resistant infections. 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humira can lower your ability to fight infections, including tuberculosis. serious, sometimes fatal events, such as infections, lymphoma, or other types of cancer have happened. blood, liver and nervous system problems, serious allergic reactions, and new or worsening heart failure have occurred. before starting humira, your doctor should test you for tb. ask your doctor if you live in or have been to a region where certain fungal infections are common. tell your doctor if you have had tb, hepatitis b, are prone to infections, or have symptoms such as fever, fatigue, cough, or sores. you should not start humira if you have any kind of infection. make the most of every moment. ask your dermatologist about humira, today. clearer skin is possible. and now, for a look at the morning road conditions. streets are still saturated in colorado. wet highways from nebraska to wisconsin. flooded streets across south texas. and slick at times in the southeast. >> a good day for flying. weather-related airport delays are expected only in kansas city and salt lake city. back to the news now. the latest developments in the shooting at the washington navy yard. >> the fbi has called off the search for a second shooter. investigators say aaron alexis was the lone gunman. alexis managed to kill 12 people before he was shot dead by police. eight victim, including a d.c. police officer were hurt. witnesses described how that shooting started. >> everyone said, this is no drill. go, go, go. emergency exits, now. go, go, go. >> i heard three gunshots. pop, pop, pop. straight through the halls. about three seconds later, there were four more gunshots. >> friends of aaron alexis say they cannot believe he was capable of this kind of violence. they describe him as a devout buddhist, who wanted to become a monk. new details of the killing of an unarmed man. police say jonathan ferrell was shot ten times by the officer now charged in his death. >> the former college football player was in a car crash and sought help from a nearby house. he was killed as police approached that responded. his mother forgives the police officer. >> this is not someone who posed a threat to the officers or anyone else. this is an everyday american. and that should be just as appalling and scary, frightening for the public. >> the officer has been charged with voluntary manslaughter. he is out on bond right now. but is expected to make a courtroom appearance today. now, to the united nations finding ways to call convincing evidence for the use of chemical weapons in syria. but no proof of who used them. u.n. inspectors report rockets loaded with sarin were fired from where syria's military has some bases. but the evidence could have been manipulated. now, the u.s., britain and france insist the assad government was responsible. russia disagrees, calling the evidence inconclusive. paying less than $3 a gallon of gas may be a thing of the pass. the average cost of a gallon of gas has received above that mark since december 2010. aaa is predicting another 1,000 days of similar prices. and turning to this morning's medical headlines and new, hard numbers. federal health officials report at least 2 million americans are sickened by antibiotic-resistant bacteria every year. it's not from overuse. in human, the government estimate that 70% of all antibiotics used in the u.s. are used in industrial farming to make animals grow faster. and sports time. afc rivals, facing off on monday night. >> that's right. here are our friends at espn with all the highlights. >> good morning, america. linda cohn, kneel everett, coming from your "sportscenter" studios in los angeles. >> how about that, america. linda cohn. lucky you. let's go to cincinnati, where it was unlucky for pittsburgh, as the steelers looking to put one past former teammate, james harrison, playing for the bengals. he didn't have an impact. but two touchdowns. bengals up 17-10. steelers down ten. ben roethlisberger's pass is tipped. and reggie nelson wins the tip drill. the steelers are 0-2. cincinnati, 20-10. how about the indians and royals? james shields, dominant for k.c. shields, striking out michael borne in the first. and gets jason kitna looking. and then, mr. gomes, get out of there. season-high ten ks in the game for shields. two on, lorenzo cain, off of scott kazmir, off the wall. cain goes to third. and cain will be safe. royals win it, by the score of 7-1. unfortunately, no time to talk about the brandon lloyd zombie movie. she's linda. i'm neil. coming up next, "the pulse." a tribute to his honesty. a homeless man is honored for his good deal. and still on top. bill gates is number one of a and still on top. bill gates is number one of a very prestigious list. there's a. sleep number dual temp, the revolutionary temperature-balancing layer with active air technology that works on any mattress brand, including yours. whether you sleep hot or cool, sleep number dual 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time to check "the pulse," stories you'll going to be talking about today. and we start with surprises on the season premiere of "dancing with the stars." >> season 17, bringing out unexpected stunners. emotional highlight from valerie harper. her 21-point fox trot drew a standing ovation. even some tears. >> we will have much more on last night's stunners, later in the show. now, to a great story about doing the right thing and being recognized for it. this one involves a homeless man in boston. >> glen james was given a special citation by boston's police department. last saturday night, he found a backpack. it contained nearly 40 grand in travelers checks and a passport. he turned it over to police. at the citation ceremony, james thanked all of the people who gave him money on the street. the megarich are getting even richer. look at "forbes" latest list of wealthy americans. >> for a 20th-straight year, bill gates ranked number one on the 400 richest americans, with his net worth spiking from $72 billion, up from $66 billion a year ago. wow. warren buffett, second, with $58.5 billion. and oracle co-founder larry ellison was third place with $41 billion. >> the other notables on the list. new york mayor michael bloomberg, $31 billion. and mark zuckerberg took in the 20 spot, with $19 billion. what did we do wrong, diana? >> i don't know. i start to itch when i hear that. i can't deal with it. we have to get out of here. wait for it... wait for it... 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[ male announcer ] truth is that won't relieve all your symptoms. new alka seltzer plus-d relieves more sinus symptoms than any other behind the counter liquid gel. oh, what a relief it is. >> live from the kgo-tv broadcast center this is abc7 news. >> it is 4:28. thanks for joining us. >> we begin with the latest on the mass shooting at the washington navy yard. the facility will be open today but only essential personnel report to work. 13 people were killed including the alleged gunman, 34-year-old aaron alexis. eight others were wounded. initially they searched for a second possible shooter they now believe that the 34-year-old aaron alexis acted alone. >> he used a valid pass to access the facility the now investigators are looking into the motive. we will have the latest in the investigation coming up in a report in a few minutes. here is the alleged gunman, aaron alexis from brooklyn but lived in texas recently and worked for hewlett-packard as a subcontractor for the navy. he bought a shotgun legally in virginia but may have picked up an assault rifle and handgun yesterday. seattle police say he was arrested in 2004 after shooting out a man's tires in what he described to police as an anger-fueled blackout. his father says that aaron alexis suffered from post-traumatic stress disorder after helping with rescue attempts immediately following the september 11th attacks. he visited a buddhist temple to meditate. we spoke with his brother to law who says there were no warning signs. [ inaudible ] >> president obama has ordered flags at all federal facilities be blown after half staff through friday to on the victims of the navy yard shooting including at the white house. this morning, at 7:00 a.m. our time, defense secretary hagel will lay a wreath at the navy memorial commemorting everyone who serves in the navy. >> flags are flown at half staff at the capitol in washington, dc. you can see in this picture right there the flag. the senate will be back at work today after recessing for the day yesterday. now, the washington navy yard where 3,000 workers will show up for work. it remains closed, though, as investigators comb for evidence. we will have continuing coverage of the navy yard shootings. in five minutes we go to washington, dc, for more on the shooting investigation. we will bring you any new developments during the newscast and at abc7news.com. you can follow us on twitter, as well. >> to be clear, the facility, the washington navy yard, will