Authorities say Dorchester fire that displaced seven was arson; Mattapan man arrested at the scene

Police have arrested a Mattapan man in connection with a fire that displaced seven people in a two-family home in Dorchester this morning, according to the Boston Fire Department.

Firefighters responded to the two-and-a-half-story home at 8 Stonehurst St. about 1:37 a.m., Steve MacDonald, Boston Fire Department spokesman, said in a brief phone interview.

The fire, set on the second floor, was quickly put out. No injuries were reported, MacDonald said. MacDonald could not provide details regarding damage from the fire.

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In a joint investigation with he Boston Police Department, authorities determined the fire was arson, MacDonald said.

Upon arriving, police observed numerous people pointing and yelling at a Ford Expedition with a man in the front seat. Interviews with the residents of the building revealed that the driver of the Ford used to be in a relationship with a woman on the second floor, according to Boston Police spokeswoman Officer Nicole Grant.

Numerous witnesses observed the suspect leaving the building around when the fire started, Grant said.

Troy Poindexter, 35, was arrested and will be charged with arson and breaking and entering, Grant said. He is scheduled to be arraigned Monday at Dorchester District Court.

The Red Cross provided the displaced persons, three adults and four children, hotel rooms, toiletries, and emergency cash, according to an email the organization sent this morning.

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