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.

Governor Phil Scott identified David Maland as the fallen officer, extending his “heartfelt condolences to Agent Maland’s family, friends, and colleagues."

Officials said the agent was shot on Interstate 91, which was closed for several hours near the border with Canada.

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.

A U.S. Border Patrol agent was fatally shot Monday on a highway in northern Vermont south of the Canadian border, authorities said. The death was confirmed by the FBI and Benjamine Huffman, acting secretary of the Department of Homeland Security in Washington.