text:  One person was killed when the gunman opened fire at a campaign rally in Pennsylvania. Mr Trump left the stage with a bloodied face. He said he'd felt a bullet rip through his ear. The FBI said the gunman, stationed on a roof nearby, killed a spectator and wounded two others before being shot dead by snipers. He's been identified as 20-year-old Thomas Matthew Crooks. The focus is now on the investigation, with many questioning the security.