"We're going to ensure the public is safe before they go back on the Rainbow Bridge." A police officer directs tourists in Niagara Falls, N.Y., away from the Rainbow Bridge border crossing after a car exploded within the customs plaza on Wednesday. PMO in contact with U.S. officialsThe Rainbow Bridge connects the tourism sectors of Niagara Falls, Ont., and Niagara Falls, N.Y. The Niagara Falls Bridge Commission website, which oversees the bridges, says they see about seven million passages annually. They had just stopped at a nearby park and were heading toward the Rainbow Bridge when they heard a loud bang and saw thick smoke.