anchor: lisa lewis for us in paris. thank you for the update.ion is running high in chicago and the united states after the release of a police video showing the shooting of an unarmed black teenager. protesters took to the streets on tuesday night in what were largely peaceful demonstrations. the video shows a man as he was being shot while walking away from police. he was shot 16 times by an officer, who said he felt threatened by the teenager, who was carrying a pocket knife. more than a year after the incident happened, the officer has been charged with first-degree murder. many people have taken to twitter to express their outrage over this police video. th eman's name was mentioned as a #almost 200,000 times. let's take a look at some of those reactions. "vice" magazine wrote, simple, if the video did not exist, his killer would still be free. this from an activist, he was killed with a sense of casualness i the officer that should frighten you. others tweeted using the #15 bul6 bullets. how do you justify one bullet, let alone 16 bullets?