Live Updates: Trump rally shooting investigation continues as new details emerge about assassination attempt

An investigation is continuing into the assassination attempt on former President Donald Trump, who appeared at the Republican National Convention in Milwaukee Monday night — the first time he has been seen in public since he was shot and injured at his campaign rally in Pennsylvania. 

The crowd at the convention cheered Trump, whose ear was bandaged after it was hit by a bullet on Saturday.

Details are emerging about the moments that led up to the shooting. People alerted law enforcement to the gunman on the roof of a building about 410 feet away from the stage at least two minutes before the first shot was fired at Trump, video analyzed by CBS News shows.