Authorities have confirmed that four U.S.-Canada border crossings near Niagara Falls have been closed as investigators respond to a possible vehicle explosion at Rainbow Bridge, in western New York.
The FBI Buffalo Field office posted a statement on social media saying it is "investigating a vehicle explosion at Rainbow Bridge, a border crossing between the U.S. and Canada in Niagara Falls."
It added that the situation is very fluid, so "that's all we can say at this time."
This is a breaking news story. Please check back for updates.
