The United States Attorney in Buffalo says there is no indication of a terrorist attack in the vehicle crash and explosion that left two people dead at a checkpoint on the American side of a U.S.-Canada bridge.The vehicle was speeding Wednesday from Niagara Falls, New York, toward the Rainbow Bridge, which connects the two countries across the Niagara River.Surveillance video recorded at the border crossing shows a car veer off the road and shoot airborne towards the crossing.The crash raised concerns on both sides of the border. The incident prompted the closing of the border crossing and three others in the area.