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Authorities on Tuesday are 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.

The agentโ€™s death Monday afternoon was confirmed by the FBI and Benjamine Huffman, acting secretary of the Department of Homeland Security in Washington. The injured suspect was taken into custody after the violence on Interstate 91 in Coventry, about 20 miles (32 km) from the Canadian border, the FBI said in a statement.

Coventry is close to the U.S. Customs and Border Protectionโ€™s Newport Station, part of the Swanton Sector that encompasses Vermont and parts of New York and New Hampshire. The area includes 295 miles (475 kilometers) of international boundary with Canada.

A portion of the interstate was closed after the shooting and fully reopened less than a day later.

Huffman said the agent died โ€œin the line of duty.โ€ The identity of the agent, who was assigned to the U.S. Border Patrolโ€™s Swanton Sector, was not immediately released.

The agent was shot at 3:15 p.m. on the interstate in Orleans County, a small community of 27,000 residents in the rural and remote Northeast Kingdom section of Vermont that straddles the Canadian border.

The Derby Lineโ€“Rock Island Border Crossing is located about 12 miles (19.3 kilometers) by highway north of Coventry. Itโ€™s a major link to the Canadian province of Quebec, giving northern Vermont more French speakers than most of New England.

Vincent Illuzzi, the stateโ€™s attorney in neighboring Essex County, drove past what appeared to be a U.S. Border Patrol agent traffic stop on I-91 past the Newport exit Monday afternoon, he said, shortly before authorities reported the shots were fired.

โ€œIโ€™m heading down the road, not much traffic, and I saw them on the right,โ€ he told The Associated Press over the phone Tuesday.

The agent was driving an unmarked white pickup trick with a cab on it and red and blue flashing lights, he said. The stopped vehicle appeared be a small, blue car, he said. The agent was speaking with someone standing in front of his truck, behind the car, he said.

โ€œNothing unusual at that point,โ€ Illuzzi said, but when he got back on the highway later that night, it looked like the same two vehicles were still parked and other law enforcement vehicles had arrived.

Illuzzi said the U.S. Border Patrol works closely with state and local police in his county. โ€œWe have limited law enforcement and theyโ€™re often primary responders in emergency cases.โ€

U.S. Customs and Border Protection, the Vermont State Police and Orleans County stateโ€™s attorneyโ€™s office declined to comment Tuesday. U.S. Customs and Border Protection planned to release information as it became available, an agency spokesperson said in a statement.

Vermontโ€™s Sen. Bernie Sanders, Sen. Peter Welch and Rep. Becca Balint sent condolences to the agentโ€™s family in a joint statement and said Border Patrol agents โ€œdeserve our full support in terms of staffing, pay and working conditions.โ€