WINDSOR MILL, Md. (WJZ) — Officials have deemed a three-alarm fire that displaced more than two dozen families on Tuesday accidental in nature.

Investigators from the Baltimore County Police Department ruled the fire was caused by a malfunction in the building’s chimney exhaust system.

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The blaze broke out just after 11:45 a.m. at the Tuscany Gardens Apartments in the unit block of Springridge Court near Windsor Mill. In total, 27 families were displaced across five buildings.

The fire spread in part due to a shared attic space, officials said.

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CBS Baltimore Staff