Two men , shocked at what they saw , describe an unarmed teenager with his hands up in the air as he 's gunned down by a police officer . They were contractors doing construction work in Ferguson , Missouri , on the day Michael Brown was killed . And the men , who asked not to be identified after CNN contacted them , said they were about 50 feet away from Officer Darren Wilson when he opened fire . An exclusive video captures their reactions during the moments just after the shooting . `` He had his f**n hands up , '' one of the men says in the video . The man told CNN he heard one gunshot , then another shot about 30 seconds later . `` The cop did n't say get on the ground . He just kept shooting , '' the man said . That same witness described the gruesome scene , saying he saw Brown 's `` brains come out of his head , '' again stating , `` his hands were up . '' The video shows the man raising his arms in the air -- just as , he says , Brown was doing when he was shot . The other contractor told CNN he saw Brown running away from a police car . Brown `` put his hands up , '' the construction worker said , and `` the officer was chasing him . '' The contractor says he saw Wilson fire a shot at Brown while his back was turned . The men said they did n't see how the confrontation started . Police arrest Michael Brown protesters near interstate . Other witnesses also said teen 's arms were raised . An attorney for the man who filmed the video says it was recorded 40 seconds after the shooting . The video gives new insight into the case , which has spurred a Justice Department investigation , national debate and protests over authorities ' handling of the case . The construction workers said they do n't live in Ferguson and do n't know the Brown family , but their account squares with accounts from several other witnesses of the unarmed African-American teen 's shooting death on August 9 . Some witnesses say the teenager assaulted the white officer at the outset and tried to grab his gun ; other witnesses say Wilson was the aggressor . A private autopsy conducted for the Brown family showed that Brown had been shot at least six times , including twice in the head . A grand jury is hearing the case and will determine whether Wilson will face any charges . Protesters were near Interstate 70 and outside the police headquarters Wednesday , pushing for Gov . Jay Nixon to appoint a special prosecutor to investigate Brown 's death . Analysts debate video 's impact . CNN senior legal analyst Jeffrey Toobin says the video could play an important role in the case . `` You have practically in real time someone discussing what they saw , and that 's just good evidence , '' he said on CNN 's `` AC360 . '' Sunny Hostin , a CNN legal analyst and former federal prosecutor , says it 's important to note that several witnesses are telling the same story . `` They 're saying that he was running from the police officer and that his hands were up , '' she said . `` I do n't know what other witness testimony at this point or account we have to hear . The bottom line is having your hands up is the universal sign for surrender . '' Neil Bruntrager , general counsel for the St. Louis Police Officers Association , cautioned against rushing to judgment . Witness accounts are important , he said , but need to be evaluated with all the evidence . `` I 'm not saying disregard them . I 'm saying that we will judge their credibility by all of the evidence , not by one statement , and certainly not by a 15-second video clip , '' he said . Complete coverage of the Michael Brown shooting and protests .
A video shows witnesses reacting to the Michael Brown shooting . They describe the teen holding his hands in the air . Their accounts coincide with several other witness descriptions of the shooting . CNN senior legal analyst says the new video is `` good evidence ''