The suspected gunman in a shooting in Hampton Beach, New Hampshire, in the hours after July 4 was an active-duty member of the U.S. Navy, officials said Monday.

The New Hampshire Attorney General’s Office had previously identified the man who shot a man and woman, then himself, early Sunday morning as 21-year-old Tyshawn Cooper. Cooper died by suicide in a confrontation with police.

Cooper worked on the USS Hampton as an information systems technician (submarines), second class, according to an update from prosecutors and state and local police on Monday. He was living in New Hampshire for the military assignment — the submarine has been at the Portsmouth Naval Shipyard.

If you or someone you know is in crisis, call or text 988 to reach the Suicide and Crisis Lifeline or chat live at 988lifeline.org. You can also visit SpeakingOfSuicide.com/resources for additional support.

Cooper was not on duty at the time of the shooting, a spokesman for the Navy told NBC10 Boston Monday.

“We are deeply saddened by this event and extend our heartfelt condolences to the victims and their families. The Navy is cooperating fully with the New Hampshire State Police, who are leading the investigation into the circumstances of the shooting,” the statement said.

The USS Hampton, an attack submarine, is named for four cities with the name Hampton, including New Hampshire’s.

The man, 23, and woman, 25, remained hospitalized on Monday, officials said.

The Naval Criminal Investigative Service was reviewing the incident along with state police and prosecutors, according to officials’ update.

Officials haven’t yet said what’s suspected to have led to the shooting, first reported on Ocean Boulevard about 1:19 a.m. Sunday. Officers then encountered Cooper near P Street and Ashworth Avenue, according to the New Hampshire Attorney General’s Office. During that interaction, the suspect pulled out a handgun and shot himself in the head. At the same time, an officer fired their weapon.

The Office of the Chief Medical Examiner ruled the cause of death was a gunshot wound of head and that the manner of his death was suicide.

Though the officer’s shot was not the cause of death, the Attorney General’s Office will conduct a use of force investigation.

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One person was seriously injured in a small plane crash in Newport, New Hampshire, on Sunday.

Newport police and fire responded to Parlin Airfield shortly after 1 p.m. Sunday for a reported plane crash. When they arrived, they said they found a private, single-engine plane in a wooded area off the end of the grass runway.

An off-duty Newport police employee had witnessed the crash, and assisted Newport fire personnel in removing the pilot from the plane. The pilot sustained serious, but non-life-threatening injuries and was flown by medical helicopter to Dartmouth Hitchcock Medical Center in Lebanon.

The pilot’s name has not been released. They were the only one in the plane at the time of the crash.

The cause of the crash is under investigation by the Federal Aviation Administration, with assistance from local, state and federal authorities.

Anyone who may have witnessed the crash or has further information is encouraged to contact police at 603-863-3232.