Authorities recovered an “AR-style rifle” at the scene of the shooting, according to law enforcement officials. The gunman fired from a roof outside the rally, the officials said.

Federal officials investigating the shooting said the AR rifle was “nothing special ... heat and the prone firing position ...

He grabbed three guns from the house -- a semi-automatic AR-15 assault rifle made by Bushmaster and ... Authorities say the first emergency call about the shooting came in at "approximately ...

Florida Keys deputies arrested three people Thursday who are accused of accidentally firing an AR-15 rifle into a nearby house while shooting at makeshift practice targets in a backyard.