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

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.