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Blaze in Massachusetts apartment building kills two young boys

An arson detection dog and investigator from the State Fire Marshal's office search through debris after an apartment fire in Lawrence, Mass., Tuesday, Oct. 21, 2014. Two children died in the blaze. (AP Photo/Charles Krupa)

An arson detection dog and investigator from the State Fire Marshal's office search through debris after an apartment fire in Lawrence, Mass., Tuesday, Oct. 21, 2014. Two children died in the blaze. (AP Photo/Charles Krupa)

Police and relatives have identified the two young boys killed in a four-alarm fire at a Massachusetts apartment building

Nine-year-old Kelvin Medina and his 4-year-old brother, Giancarlo Marrero, were trapped in a third-floor bedroom, after the fire broke out in Lawrence just after 3 a.m. Tuesday.

The state fire marshal determined that the blaze was an accident caused by an electrical wiring failure in a first-floor ceiling in the three-story, six-unit apartment building. Several cars were also destroyed by the fire.

Autopsies are scheduled on the boys' bodies.

Residents who escaped said they were alerted by smoke alarms and a stranger who threw rocks at windows to alert residents.

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Fire Marshall Stephen Coan says 48 people have died in fires in Massachusetts this year.

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