BOSTON (WHDH) - Firefighters responded to a heavy six-alarm fire in Charlestown Friday morning shortly before 7 a.m.

Boston Fire Department responded to a fire at a mixed use building at 144 Bunker Hill Street. Crews found thick, black smoke pouring out of a wooden-framed three-story building.

The first floor of the building is for commercial use and the top two floors are for residential use.

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More than 20 residents were displaced by the fire in this and surrounding buildings. No injuries were reported.

Boston Mayor Marty Walsh and Red Cross teams arrived to the scene.

The MBTA provided a warm bus for the the six people displaced by the fire.

The BFD posted photos on the department’s Twitter page, showing the intensity of the smoke in icy weather conditions.

Tough weather conditions. 2 degrees now. pic.twitter.com/IdK0j1ira1 — Boston Fire Dept. (@BostonFire) December 16, 2016

This is a developing story. Stay with 7News for updates.

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