The FBI is investigating a vehicle explosion that occurred Wednesday at the Rainbow Bridge border crossing between the U.S. and Canada.

The vehicle was heading from the U.S. to Canada and was going in the direction of the border officer building, sources told Fox News’ Alexis McAdams.

All bridges were closed in the area, and all government buildings were evacuated, according to sources. Sources tell Fox News’ Alexis McAdams that the incident was being treated as a possible attack.

Fox News’ Alexis McAdams was told by sources that the explosion was so big and fierce, that authorities first thought it was a terrorist attack.

New York Governor Kathy Hochul said the incident happened at 11:27 a.m. when someone driving a car crashed into a median at the border crossing. She added that there’s “no sign” that the incident was a terrorist attack, adding that a “local individual” was involved.

International border crossing points between Canada and Western New York are closed after the reported incident, which has also injured at least one person, a 27-year-old male who was taken to Niagara Falls Memorial Hospital with minor injuries, including back pain and minor cuts. His condition is not severe.

“The FBI Buffalo Field Office is investigating a vehicle explosion at the Rainbow Bridge, a border crossing between the US and Canada in Niagara Falls,” the FBI said in a statement.

It continued, “The FBI is coordinating with our local, state, and federal law enforcement partners in this investigation. As this situation is very fluid, that’s all we can say at this time.”

Rainbow Bridge connects Niagara Falls, New York with Niagara Falls, Canada. New York Governor Kathy Hochul said in a statement that she’s traveling to Buffalo.

“I have been briefed on the situation that occurred at the Rainbow Bridge in Niagara Falls,” Hochul said. “At my direction, the New York State Police is actively working with the FBI Joint Terrorism Task Force to monitor all points of entry to New York.

I am traveling to Buffalo to meet with law enforcement and emergency responders and will update New Yorkers when more information becomes available.” New York City Mayor Eric Adams said that the NYPD has enhanced security.