This article makes it seem like it all happened on the US side:
Quote:
Traveling down Niagara Street, the car sped onto the bridge plaza, went through a fence separating the inbound lanes from the outbound lanes, and toward the inspection lanes where it exploded, according to law enforcement sources at the scene.
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Ivan Vitalii, a visitor to the Falls from Ukraine, said he and a friend were at the 7-Eleven convenience store in the 400 block of Niagara Street when they observed a car exit the parking lot and travel toward the bridge. Vitalii said he and his friend moved down to the bridge area where they observed what appeared to be the same car on fire near the entrance to the bridge.
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https://www.niagara-gazette.com/news...89455.amp.html