Video footage has captured the moment a gunman open fires from the roof of a building near Donald Trump's rally in Pennsylvania. The FBI said it was treating the incident as an assassination attempt. It has identified the shooter as 20-year-old Thomas Matthew Crooks - he was shot and killed by the Secret Service. One bystander was killed in the shooting and two others were critically injured, police said. Subscribe here: For more news, analysis and features visit: #DonaldTrump #US #BBCNews
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