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

David C. Maland was conducting the traffic stop​ on Interstate 91, about 20 miles from the Canadian border when "an exchange of gunfire occurred," FBI said.

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