The federal officer killed while on duty near the Canadian border has been identified as a U.S. Air Force veteran who provided security at the Pentagon during the Sept. 11 attacks.

The FBI is investigating after a U.S. Border Patrol agent and another person were shot and killed Monday afternoon in Coventry, Vermont, just south of the Canadian border, according to federal officials.

Agent David “Chris” Maland died in a shooting following a traffic stop, the FBI said. A second person killed in the incident was a German national in the country on a current visa, authorities said.