NASHUA, N.H (WHDH) - Officials are investigating the cause of a building fire in Nashua, New Hampshire.

Firefighters responding to a reported fire on Harbor Avenue around 10 a.m. Friday found heavy smoke and flames coming from the multi-unit building.

The American Red Cross also arrived at the scene.

No additional information has been released.

This is a developing story; stay with 7NEWS on-air and online for the latest updates.

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