Authorities are investigating a possible arson fire Monday night in a vacant three-family house on Chester Avenue in Chelsea, said Deputy Fire Chief Robert Houghton.
The two-alarm blaze broke out in a building officials believe was vacant, Houghton said.
“We’re assuming that it was vacant,’’ he said. “There were some neighbors who said no one had lived there for a while.’’
Firefighters responded shortly after 10:30 p.m. and saw heavy fire on the first floor of the home, Houghton said. Flames spread quickly.
It took firefighters some 90 minutes to extinguish “all the little hot pockets of fire,’’ Houghton said.
Firefighters cleared the scene at 2 a.m., he said. There were no injuries to any firefighters, Houghton said.
Chelsea firefighters were assisted by the Boston, Everett, Revere, and Winthrop fire departments.
The three-family home appears to be totally destroyed by the fire, he said.
State Fire Marshal Stephen D. Coan’s office is assisting Chelsea’s arson unit in the investigation, officials said. Coan said his office routinely assists Chelsea and other fire departments in fire investigations, and the Chester Avenue fire is the latest example.
Investigators are back on the scene today searching for a cause and the point of origin.