The FBI is investigating after a U.S. Border Patrol agent and another person were shot and killed Monday afternoon in Coventry, Vermont, just south of the Canadian border, according to federal officials.

A U.S. Border Patrol agent killed during a traffic stop near the Canadian border worked security duty at the Pentagon during the time of the Sept. 11 attacks.

U.S. Customs and Border Patrol confirmed Tuesday afternoon that the slain agent was David C. Maland. The FBI, meanwhile, said the other person killed was a German national on a current visa.