The Department of Homeland Security’s U.S. Customs and Border Protection said in a statement that the agent was killed in the line of duty, although it did not provide details.

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

A United States Border Patrol agent was gunned down during a traffic stop in Vermont near the Canadian border, officials have confirmed. It happened around 3:15 p.m. Monday on Interstate 91 in Coventry, 20 miles from the Northern border, according to the Department of Homeland Security.