An explosion involving a vehicle entering the United States on Wednesday caused the closure of the Rainbow Bridge, a border crossing between the United States and Canada, in the Niagara Falls region, according to the authorities.
The F.B.I.’s Buffalo field office said in a post on X, formerly known as Twitter, that the agency was coordinating with local, state and federal law enforcement in investigating the explosion.
“As the situation is very fluid, that’s all we can say at this time,” the post said.
Gov. Kathy Hochul of New York said she had been briefed on the incident and was closely monitoring the situation, adding that “state agencies are on site and ready to assist.”
The New York State Police are working with the F.B.I. to monitor all points of entry to New York, Ms. Hochul said.
Officials didn’t say if there were any injuries caused by the explosion.
Other border crossings in the region — Peace Bridge, Lewiston-Queenston Bridge and Whirlpool Bridge — were also closed Wednesday afternoon, with no immediate timeline to reopen.
Remaining international crossings are open and on heightened alert status, according to a spokesman with the governor’s office, while airports and railway facilities in the area have increased security. There are also additional explosive detective dogs and police patrols, and additional screening is being deployed at Buffalo Airport.
