BOSTON (CBS) – An early morning fire in Allston set off live ammunition inside a two-and-a-half story home, officials said.

Crews responded at 1:46 a.m. Wednesday to 42-44 Raymond Street, where they battled heavy fire before they were ordered out of the two-apartment building.

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“Firefighters pulled out during the fire with reports of live ammunition going off,” the Boston Fire Department tweeted.

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No one was hurt in the fire, but three adults and one teenager were displaced. Damage is estimated at $600,000.

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The fire was determined to be caused by careless disposal of smoking materials, officials said.