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

David Maland, 44, was a military veteran who worked security duty at the Pentagon during the Sept. 11 attacks, his family said.

David “Chris” Maland, the Border Patrol agent killed Monday, was shot while conducting a traffic stop in a Vermont town near the Canadian border, according to the FBI’s latest update on the case.

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.

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 and local law enforcement were investigating a shooting involving a United States Border Patrol agent in Coventry, Vermont.

FBI says 1 suspect is dead and another is in custody in the shooting of US Border Patrol agent in Vermont. In one recent incident in Ohio’s affluent neighborhood, a neighbor called out the real estate developer,

Vincent Illuzzi, the Essex County state’s attorney, described the shooting as happening during a traffic stop. He said he believed the stop was related to immigration enforcement.