The sniper who killed the conservative activist Charlie Kirk was still on the loose on Friday even as investigators flooded the internet with photos and video of a man believed to have carried out Wednesday's politically charged killing at a Utah university.

Conservative activist Charlie Kirk was fatally shot in a state that has permissive gun laws and allows firearms to be concealed or openly carried without a permit in most instances, experts said.

Kirk has been taking his "American Comeback Tour" to universities across Florida, starting at the University of South Florida in Tampa in February before heading to the University of Florida in Gaine...