Authorities on Tuesday were investigating a fatal shooting of a U.S. Border Patrol agent that also left a suspect dead and another injured on a Vermont highway near Canada, authorities said.

Agent David Maland was killed Monday afternoon by gunfire following a traffic stop, a U.S. Customs and Border Protection spokesperson said in a statement. The injured suspect was also taken into custody, the FBI said in a statement.

The agent’s death Monday afternoon was also confirmed by the FBI and Benjamine Huffman, acting secretary of the Department of Homeland Security in Washington. Huffman said the agent died “in the line of duty.”

The violence temporarily closed part of Interstate 91 about 20 miles from Canada in Coventry, part of the small, 27,000-resident community of Orleans County in the Northeast Kingdom section of Vermont that straddles the international border.

Maland was killed close to the U.S. Customs and Border Protection’s Newport Station, part of the Swanton Sector that he was assigned to.

— The Associated Press