This is the cbs evening news with scott pelley. Pelley this is our western edition. An act of terror in the heart of paris has shaken the city of light. Tonight, the famous champselysees is locked down after a French Police officer was shot dead and two others were wounded. Police shot and killed the attacker. This happened three days before the french begin electing a new president. And at least one candidate has called for the campaign to be suspended. Elizabeth palmer is in paris. Reporter minutes after the shooting, Police Rushed to secure central paris, clearing panicked bystanders away to safety. In this video from social media, and not yet confirmed, you can see two armed men, possibly police, moving near a vehicle. French Officials Say a man armed with a kalashnikov opened fire on police officers. One of them was killed and two more were injured, and the attacker himself was shot dead. This man is a tourist here in paris and saw it all. The guy, he was shouting to police. He tried to shoot, and then suddenly five, 10 seconds, or whatever, policemen came and start to shoot this guy, and immediately he is he was down. Reporter french president francois hollande, in a special televised address, confirmed tonight that the shooting was a terrorist attack. Forensic teams are still gathering evidence at the scene on one of paris busiest boulevards. Already, isis has claimed responsibility for the attack, and theyve named the attacker. Abuyusuf albaljiki, which indicates hes from belgium, although french authorities have not yet confirmed that. Although, scott, french media tonight are identifying the man by a completely different name. Kareem see. They say that hed done jail time here in france for attempted murder before, of three men, including two police officers. This couldnt come at a more sensitive time. The president ial election is supposed to take place on sunday, and theres a real chance this could affect the sult. Pelley Elizabeth Palmer in paris for us tonight. Tz, thank you. Speaking to reporters at the white house today, President Trump was quick to call the paris shootings a terrorist attack, and he said, it never ends. Earlier, the president talked tough on trade, which could affect relations with china and canada. Margaret brennan is at the white house tonight. Margaret, what did the president say . Reporter well, scott, the president launched an investigation into foreignmade steel and whether its a threat to national security. This could be the first step before putting tariffs on steel imports. Of course, china is the worlds biggest steel producer, but the president stopped short of directly challenging beijing because, of course, he needs their help on many issues, particularly, north korea. Now, the president did not mince words, though, when he was talking about canada. He said that countrys trade practices were a disgrace, and he promised again to renegotiate nafta. But to do that, the white house first has to get congress to sign off on a plan, and, scott, they still have not sent a final proposal up to the hill. The white house did tell us, though, that theyre working on it. Pelley and, margaret, also, today, the president s attorney general, Jeff Sessions, raised some eyebrows with what appeared to be criticism of the judicial branch. Reporter yes. Well, the second version of the president s travel ban on six muslimmajority countries is being held up by a federal court judge in hawaii. And in a radio interview recorded on tuesday, attorney general jeff session seemed to raise some questions about the judge and the state of hawaii. I really am amazed at a judge sitting on an island in the pacific can issue an order that stops the president of the United States from what appears to be clearly his statutory and constitutional power. Reporter now, hawaiis senators, who are both democrats, pounced on those remarks in a series of tweets. Ill read you some of them, pointing out senator brian schatz, that sessions actually voted in the senate to confirm the judge in question here. And the other senator from hawaii, mazie hirono, accused Jeff Sessions of what she said was dog whistle politics. Scott, thats another way of suggesting hes being racist. Pelley still 50 stars in the flag. Margaret brennan for us at the white house. Margaret, thank you. Well, another federal judge that mr. Trump clashed with during the campaign is back in the spotlight tonight. Gonzalo curiel has been assigned to preside in a lawsuit brought by a 23yearold illegal immigrant who has been deported to mexico. The man claims that his dreamer status should have allowed him to stay in the country because he arrived here as a child. Judge curiel presided over two lawsuits involving the nowdefunct Trump University which were settled. Mr. Trump questioned his impartiality, calling him, a mexican. Judge curiel was born in indiana. The decision by fox news to fire bill oreilly may not end the Sexual Harassment scandal there. Federal prosecutors have launched a criminal investigation, according to a lawyer for a woman who is suing roger ailes, the former chairman of fox news. Anna werner is following this. Reporter the board of 21st century fox met inside fox news headquarters today shame on fox reporter while outside, the National Organization for women declared the ouster of Host Bill Oreilly isnt enough. We thought it was really important to come out and shame the 13 members of the board of directors of 21st century fox who have allowed this culture to flourish. Reporter federal prosecutors have questions, too. A lawyer representing former fox news cohost andrea tantaros, who is suing former fox news chairman roger ailes, says the u. S. Attorney has subpoenaed one of his other clients. I want to be clear that i dont know what the nature of the investigation is. I do know that when fox news fought to settle with andrea tantaros, they wanted to pay the settlement out as salary. The inference i draw from that is that there may have been a studied effort to hide the fact that there were all these settlements being paid out by disguising them as salary. Reporter Tucker Carlson will replace oreilly, but of the 50 or so companies that yanked ads from the show, most told us today they have not decided whether to move their ads back to the time slot. Viewership has remained steady. Public relations specialist howard bregman. Viewers are not their problems. Advertisers, yes. They have to go and look at their advertisers, the people that pay for their network, where the profits come from, and say, heres the changes weve made, and heres why were a safe place for to you put your money. Reporter fox news did not respond today to our questions about the u. S. Attorneys investigation. Oreilly called the allegations against him unfounded yesterday, and roger ailes has denied the allegations against him in the past. Scott. Pelley anna werner, thanks. Well, as you just saw, members of the National Organization for women protested outside fox news headquarters, demanding that the company fire executives who company fire executives who were aware of Sexual Harassment but did nothing. Americas perception of workplace harassment has been evolving over these years, and alex wagner has more on this. Fire bill oreilly. Reporter intense public outcry over the latest Sexual Harassment allegations against bill oreilly ultimately brought down one of the most powerful people in cable news. Professor, do you swear to tell the whole truth . Reporter but the reaction 26 years ago was much different when anita hill accused Supreme Court nominee Clarence Thomas of harassment. Of his own sexual prowess. Reporter last october, hill told cbs news that the focus of the issue has to change. Starting, really, how are we going to measure punishment from the point of view of the person who has been harmed . Companies are going to be held to account. Reporter fatima goss graves, incoming president at the National Womens law center, says that may be happening. So we are at, really, a Tipping Point of public attention, public awareness, and transparency on the issue of harassment. Reporter according to a cbs news poll conducted last september, 78 of women and 71 of men believe Sexual Harassment exists in the workplace. But just 37 of victims report it to a supervisor. Most women never report harassment at all because they fear retaliation, because they believe that they wont be believed, because they think theyll be discounted. And that has been true for a long time. Fox news. Reporter graves says while the ouster of oreilly and former fox chairman roger ailes could signal a sea change, other examples show theres more work to do. She says last falls leaked access Hollywood Tape of thenpresident ial candidate donald trump is one of them. Unfortunately, the lesson that we learned after the election was that sometimes harassers are rewarded. Reporter the equal Employment Opportunity office, which tracks harassment allegations, reports that in the last three years, some 36,000 people have filed federal complaints, receiving 110 million in settlements. But, scott, fatima graves says because harassment is underreported, that is just the tip of the iceberg. Pelley alex wagner with us tonight. Alex, thank you. Today the university of california at berkeley reversed its decision to cancel a speech by conservative commentator ann coulter over security concerns. Theyre now offering a makeup date at a more secure venue. John blackstone is following this. Reporter on the berkeley campus, opposition to ann coulters appearance adds to a growing impression that conservative opinions are not welcome at many of the nations public universities. I was the person who personally invited ann coulter. Reporter this is the spokesman for the Berkeley College republicans. These students are trying to create a liberal echo chamber on campus where one viewpoint is allowed and the other viewpoints are attacked and harassed. He was rushed from the building reporter violence erupted on february when outspoken Milo Yiannopoulos was scheduled to appear. He was rushed from the building for what Campus Police said was his own safety. Berkeley officials worry the same thing could happen to anne coulter. Berkeleys chancellor Nicholas Dirks our Police Department has made it clear they have very specific intelligence regarding threats that could pose a grave danger to the speaker, attendees, and those who may wish to lawfully protest this event. Reporter demonstrations against conservative speakers have turned violent on campuses from n. Y. U. , to the university of washington in seattle, where one man was shot in a clash between protesters. Berkeley officials blame the recent violence there on what they call the black bloc not students but outsiders who come to campus bent on destruction. Clad in black, wearing masks, highly organized, rather disciplined, armed not with firearms but armed with a number of weapons. Reporter berkeley, of course, has a long history of protests. Today, scott, School Officials had to answer to conservivities whether the only free speech welcome here is from want left. Pelley john blackstone, our man on campus. John, thank you. Surveillance video has just been released from the tragic shooting incident last summer. Police in punta gorda, florida, were conducting a Training Exercise with members of the community and 73yearold Mary Knowlton was playing a cop. Officer lee cole was playing the suspect. He fired, not knowing that his gun was loaded with live rounds. Knowlton was killed. Cole was fired and faces felony manslaughter charges. Police chief tom lewis is charged with misdemeanor negligence. A 15yearold tennessee girl is on her way home tonight after being rescued near a cabin in northern california. She disappeared more than a month ago with her teacher. Police say 50yearold tad cummins surrendered without incident, and was arrested. He faces multiple charges, including aggravated kidnapping and sexual contact with a minor. Coming up next on the cbs evening news, support for legalized pot has never been higher. And later, a possible new danger linked to diet soda. Introducing new depend real fit briefs. Now more breathable than ever. In situations like this, theres no time for distractions. Its not enough to think im ready. I need to know im ready. No matter what lies ahead. Get a free sample at depend. 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Homeland security secretary john kelly recently warned of a possible crackdown in states that have legalized pot. Its use and possession is against federal law, and until the law is changed by the United States congress, we in d. H. S. , along with the rest of the federal government, are sworn to uphold all the laws that are on the books. Reporter John Hickenlooper is governor of colorado, the first state where legal Recreational Marijuana went on sale in 2014. Do you think you or other states will go to court and fight this . Well, well certainly explore every option. We should communicate and collaborate and not make a snap decision. Reporter in colorado, medical and Recreational Marijuana are now a 1. 3 billion industry. Shutting it down, says the governor, will drive people to the dangerous black market. Theres just going to be a vacuum to fill, and its all going to be cash and guns. Drug dealers dont care who they sell it to. Reporter there are also concerns that not enough studies have been conducted on pots effect, especially on unborn babies or teenagers, whose brains are still developing. And pot shop owner Sally Vanderveer of medicine man, worries a crackdown will put thousands in this industry out of work. These are good jobs. These are fulltime jobs. These are fulltime jobs. Our average salary is probably about 35,000 a year. These are people paying taxes. Reporter as you can see and you will occasionally hear, scott, the party is still going on in denver. Now, our poll shows 71 of americans oppose any federal action in states that have already legalized marijuana. That said, here in colorado, people in the pot business are hastily drawing up contingency plans just in case. Pelley barry petersen, and well be right back. Why pause a spontaneous moment . Cialis for daily use treats ed and the urinary symptoms of bph. 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Pelley a new study is raising Health Concerns about diet soda. Heres dr. Jon lapook. Reporter about one out of every five americans consume diet drinks. Thats more than three billion gallons a year. Yeah, i prefer diet because i just think it tastes better. Reporter the researchers analyzed 10 years of data where people gave detailed information about their eating and drinking habits. Over that decade, 5 developed dementia. Drinking at least one artificially sweetened beverage a day more than doubled the risk of dementia. But researchers found that other causes, such as hypertension, cardiovascular disease, diabetes, or high cholesterol, might be to blame. Matthew pase is an investigator with the framingham heart study and was the lead author on todays report. This can be confusing to people. Can you help make this more clear to people . Sure. It might be that those who consume diet sodas may have an increased risk of getting diabetes or becoming overweight, and this might be associated with an increased risk of dementia. Reporter what are you telling your friends who are asking you for advice . Well, since diet soda and regular soda have no real nutritional benefits, i suggest that people avoid them and drink water instead. Reporter thats your water cooler advice . Thats my water cooler advice. Reporter this kind of study cannot prove cause and effect. People who start drinking diet soda may already be at increased risk for dementia. For example, scott, because theyre overweight or have diabetes. Pelley jon, thanks very much. Coming up, we will save the cheetahs. ,. Pelley the fastest animal on earth cant outrun the threats in a changing on earth cant outrun the threats in a changing world, but can scientists help slow things down . Heres chip reid. Reporter oh, my god five little cheetah cubs. At just three weeks old, the newest residents of the smithsonians cheetah science facility are getting a checkup. This is where its hard because they dont like to sit still. 1. 75 kilos. Reporter thats just under four pounds. Do they have personalities at this young age . Some of them are a little more feisty. Some are a little bit more laid back. Reporter they sound like theyre purring. Is that purring . No, theyre actually growling. Reporter theyre growling. Because theyre not happy. Thats a growl, huh . The Smithsonian Conservation Biology Institute in virginia had a baby cheetah boon at the end of march, two litters in a week, 10 cubs in all. Biologist Adrienne Crosier runs the breeding program. Part of what i do is make the best genetic matches but also the best matches based on individual temperament. Reporter so you are cupid for cheetahs . Yes, i try. Reporter while cheetahs are thriving here, theyre disappearing in the wild. Theyre in such peril, some scientists are calling for them to be moved to the endangered species list. Why are they vulnerable . Mostly loss of habitats. The areas that they occupy in africa have been reduced dramatically. There are only 7,500 cheetahs left in the wild. Reporter 7,500, and thats down from what . When i first started working on cheetahs 15 years ago, they thought there were about 10,000 to 12,000. Reporter with a top speed of 60 miles an hour, its been said that nothing can outrun a cheetah except, perhaps, extinction. But these little guys are doing their best to leave extinction in their dust. Chip reid, cbs news, front royal, virginia. Pelley thats the cbs evening news. And for all of us at cbs news all around the world, the campus reversing its decision to cancel ann coulters visit over fears it couldnt safe. Kpix 5 news begins at 6 00 with ucberkeleys flipflop on free speech. The campus reversed its decision to cancel ann coulters visit over fears it couldnt keep students safe. The university now says she is welcome to come and speak just not next thursday. Kpix 5s melissa caen on the abrupt aboutface and why some say free speech does have its limits. Melissa. Reporter veronica, were here in berkeley where in recent months, the university has had some trouble dealing with conservative speakers on campus. First, it was Milo Yiannopoulos, then david horowitz, and then ann coulter had events scheduled and canceled because of security concerns. Yesterday, coulter said she was going to show up anyway on the scheduled day of her event but today, the administration offered an alternative. No one wants to see again violent objections to a speaker at berkeley causing nearly 100,000 in damage. When Berkeley College republicans invited conservative writer ann coulter to campus the University Said it wasnt given enough notice to find a safe space for the april 27 date so it canceled. Theres very specific and credible threat to miss coulters event on the 27th if it was to be health on the berkeley campus. Reporter coulter said she will show up anyway. Miss coulters announcement that she intends to come to this campus on april 27 without the regard for the fact that we dont have a protectable venue available on that date is of grave concern. Reporter chancellor Nicholas Dirks says the school looks beyond the normal venues for speaking events and found one on campus available on may 2. Ucberkeley Police Captain alex yao admits that the