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.

Federal agents are investigating after a US Border Patrol agent was shot and killed Monday afternoon on the highway in Vermont.

Authorities on Tuesday were investigating a fatal shooting of a U.S. Border Patrol agent that also left a suspect dead and another injured on a Vermont highway near Canada, authorities said. Agent David Maland was killed Monday afternoon following a traffic stop,