Authorities on Tuesday are investigating the fatal shooting of a U.S. Border Patrol agent near Canada that also left a suspect dead and another injured.

Vermont officials are mourning the loss of a U.S. Border Patrol agent killed in the line of duty near the Canadian border on Monday.

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.

Governor Phil Scott identified David Maland as the fallen officer, extending his “heartfelt condolences to Agent Maland’s family, friends, and colleagues."

Benjamine Huffman, acting secretary of the Department of Homeland Security, said the death occurred ‘in the line of duty’.

A U.S. Border Patrol agent was shot and killed in Vermont on Monday while performing their duties near the Canada-U.S. border, according to U.S. federal and state authorities.

Authorities say a U.S. Border Patrol agent has been fatally shot in northern Vermont. The acting secretary of the Department of Homeland Security said in a statement that the agent was killed Monday in the line of duty.

The Border Patrol agent was reportedly shot dead by a suspect referred to as a "visa overstay,” who has also been killed.

In a statement, the FBI said that in addition to the agent, a “subject” was killed and a third person was injured and taken into custody.

Tom Homan, U.S. President Donald Trump’s border czar, said the fatal shooting of a U.S. Border Patrol agent on a highway just south of Quebec on Monday is another sign there needs to be more focus on the U.