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.

Agent David “Chris” Maland died in a shooting following a traffic stop, the FBI said. A second person killed in the incident was a German national in the country on a current visa, authorities said.

Federal authorities say another person was killed during the incident while a third was injured and taken into custody.