Two dead after vehicle explosion at US-Canada border checkpoint

New York governor says no indication of terrorist attack' as officials investigate incident at Rainbow Bridge near Niagara Falls

• US-Canada border vehicle explosion - latest updates

A speeding car crashed in flames on the bridge linking New York state and Ontario at Niagara Falls on Wednesday, killing two people in the vehicle and sparking a security scare that closed four US-Canadian border crossings.

Hours later, federal and state authorities said investigators had found no evidence of an act of terrorism, though circumstances surrounding the crash on the Rainbow Bridge remained murky, leaving it to be determined whether it was accidental or intentional.