Brentwood, N.H. (AP) -- Authorities say a New Hampshire police officer was shot to death after he responded to a domestic disturbance at a home that later exploded and burned.
The gunman is presumed dead in the ensuing blaze.
Attorney General Joseph Foster says Monday night 48-year-old Brentwood Police Officer Stephen Arkell was shot to death when he answered the call in a suburban neighborhood.
After the shooting, the house burst into flames. A massive explosion blew the front off the house and within an hour, it was leveled.
Foster says 47-year-old Michael Nolan, the son of the homeowner, is the suspected gunman. He is presumed dead.
A third person has been taken to a hospital.
A New Hampshire house was engulfed in flames and then exploded as police responded to a shooting incident there today, state police told ABC News.
An officer was injured, though it was unclear if he was shot or was injured in the explosion, authorities said.
It was unclear what caused the explosion at the house, located in a development called Mill Pond Crossing, a retirement community, police said.
And elderly man named Walter Nolan lived in the home with his son, police said, noting there was an argument at the house, followed by gunshots and the fire, prompting neighbors to call police.
A neighbor told the Associated Press that she saw Nolan, 86, being taken from the scene by ambulance before she was evacuated from the area. Public records indicate the house is owned by Nolan and he apparently lived in the home with his son, Mike, the AP reported.
When police arrived at the scene, there was more shooting from inside the house, police said.
The injured officer was flown to Exeter Hospital, and the state Attorney General's office has taken control of the investigation, authorities said.
Neighboring houses were evacuated and firefighters initially stayed away from the blaze because of the suspected shooting, police said.
Exeter Hospital officials confirmed that one patient was brought to their hospital at about 6 p.m. but the patient being treated did not suffer a gunshot wound.
ABC News' Miseon Lee contributed to this report.