The FBI is investigating an explosion at the U.S.-Canada border

NIAGARA FALLS, N.Y. (AP) — New York Gov. Kathy Hochul said there was “no indication of a terrorist attack” in the vehicle crash and explosion that left two people dead at a checkpoint on the American side of a U.S.-Canada bridge on Wednesday.

“Based on what we know at this moment,” she said, “there is no sign of terrorist activity in this crash.”

The explosion had raised concerns on both sides of the border. Canadian Prime Minister Justin Trudeau said officials were “taking this extraordinary seriously,” and the White House said President Joe Biden was “closely following developments.”

The two deceased people were in the vehicle, a law enforcement official told The Associated Press. The official was not authorized to discuss details of the investigation publicly and spoke to the AP on condition of anonymity.

“This is obviously a very serious situation in Niagara Falls,” Canadian Prime Minister Justin Trudeau said in Parliament, before he excused himself from Question Period in the House of Commons to be briefed further.

The blast happened on the U.S. side of the Rainbow Bridge, which connects the two countries across the Niagara River. Three other bridges between western New York and Ontario were quickly closed as a precaution, and the Buffalo-Niagara International Airport began security checks on all cars and told passengers to expect additional screenings.

The FBI’s field office in Buffalo said in a statement that it was investigating the blast, and investigators with the Bureau of Alcohol, Tobacco, Firearms and Explosives were also responding to the scene.

Photos and video taken by bystanders and posted on social media showed thick smoke, flames on the pavement and a security booth that had been singed by flames.

Videos showed that the fire was in a U.S. Customs and Border Protection area just east of the main vehicle checkpoint.

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.

“All of a sudden he went up in the air and then it was a ball of fire like 30 or 40 feet high,” Guenther told the station. “I never saw anything like it.”

From inside Niagara Falls State Park, Melissa Raffalow said she saw “a huge plume of black smoke” rise up over the border crossing, roughly 50 yards (45 meters) away from the popular tourist destination.

“We didn’t hear the explosion because the falls were too loud,” Raffalow told The Associated Press in a message. Police arrived soon after, urging visitors to disperse as they began cordoning off the street.

About 6,000 vehicles cross the Rainbow Bridge each day, according to the U.S. Federal Highway Administration’s National Bridge Inventory. About 5% is truck traffic, according to the federal data.

The bridge, constructed in 1941, is just over 1,440 feet (439 meters) long and has a main span constructed of steel, according to the data.

—By Carolyn Thompson, Associated Press. Associated Press writer Michael Balsamo contributed from New York.

Update, November 22, 2023: This article has been updated with more information from New York Governor Hochul on the crash.