A Cambridge woman died after a three-alarm fire ripped through an apartment building early this morning, fire officials said.

Deputy Fire Chief Gerard Mahoney said firefighters pulled the woman, who was in her mid-30s, out of her second-floor apartment on Prospect Street, but she was in cardiac arrest.

“They were doing CPR before the ambulance took her to the hospital,” said Deputy Fire Chief Les Bokuniewicz.

Advertisement - Continue Reading Below

The woman was later pronounced dead at a local hospital, Mahoney said.

The fire, which started just before 4 a.m. at 240 Prospect, left five adults and one teenager homeless. The tenant on the top floor of the three-story building was not home when the blaze broke out.

The American Red Cross responded to the scene to provide clothing, food, and shelter to displaced families.

“We met them at the public works building on Hampshire Street, and are making sure everyone is warm and has blankets and coffee,” said American Red Cross spokeswoman Kat Powers. “It’s pretty jolting to wake up to a fire, but the public works building has opened up graciously to provide a warm place for everybody.”

Deputy Chief Bokuniewicz estimated damage at $500,000. The cause of the fire is under investigation by the Cambridge fire department and the state fire marshal’s office.