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From the AP article, it appears to be an accident

Speaking to WGRZ-TV, Mike Guenther said he saw a vehicle speeding toward the crossing from the U.S. side of the border when it swerved to avoid another car, crashed into a fence and exploded.

https://apnews.com/article/niagara-falls-bridge-explosion-4e8f9bfeabd94a0d8aa4d96eccd179b9

Investigators have found some sort of suitcase or briefcase on-scene, sources told ABC News. They are treating it as a possible explosive device as a precaution and the bomb squad is handling the package.

Right now, the situation is very fluid with FBI at the scene.