By  and Celina Tebor, CNN

CNN — Investigators believe a New York man and his wife were the two people killed in a car that crashed and exploded at a US-Canada border crossing near Niagara Falls on Wednesday, law enforcement sources say, and the FBI sees no link to terrorism.

Alarms were raised from New York to Washington, DC, late Wednesday morning after the incident on the US side of the Rainbow Bridge crossing. Investigators believe the couple was traveling in a Bentley at high speed when it struck a curb at the checkpoint, then hit a guardrail that sent the vehicle airborne and into a screening area before it exploded, according to the sources.

Despite initial concerns of a terror attack, the FBI has not found any connection to terrorism and no explosives were found at the scene, the agency’s Buffalo field office announced Wednesday night. The case is being turned over to local police as a traffic investigation.

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