The vehicle that exploded on Rainbow Bridge after hurtling into America from Canada this morning flew through the air at high speed before bursting into flames next to an immigration checkpoint. A suitcase was found inside the vehicle but it remains unconfirmed whether there were any explosives inside. Video obtained by MSNBC shows the moment the vehicle became airborne, seconds before the explosion. The Rainbow Bridge is the busiest land crossing between the US and Canada and was particularly busy on Wednesday with many traveling between the two countries for Thanksgiving. 'The FBI Buffalo Field Office is investigating a vehicle explosion at the Rainbow Bridge, a border crossing between the US and Canada in Niagara Falls.