President Joe Biden is "closely" monitoring developments after a Wednesday explosion at the U.S.-Canada border, according to the White House.

At least two people were killed Wednesday after a car crashed into a structure at the Rainbow Bridge port of entry. The FBI's joint terrorism task force is working with state authorities to monitor border crossings, raising the possibility that the incident was a terror attack, although this has not been confirmed.

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"The president has been briefed on the vehicle explosion at the Rainbow Bridge Port of Entry," White House press secretary Karine Jean-Pierre said in a statement Wednesday afternoon. "He and his team are closely following developments."

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Biden traveled to Nantucket, Massachusetts, on Tuesday evening, where he will remain through the holiday weekend. Preliminary reports suggest the vehicle was traveling into the United States.

ABC News reported that surveillance video showed the vehicle being stopped at a border checkpoint before being transferred to a second checkpoint location, at which point it accelerated before crashing and exploding.