BOSTON (WHDH) - Firefighters responded to a heavy fire in Charlestown Friday morning, working in freezing conditions to extinguish the flames.

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

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

Bitter cold made battling the fire difficult and dangerous. Water froze in the lines and an SUV parked outside the apartment ended up encased in ice from all the water. Propane tanks were brought in to melt the water frozen in the lines and the street was sanded.

More than 20 residents were displaced by the fire in this and surrounding buildings. No injuries were reported, apart from some minor bumps and bruised caused by people slipping on all the ice.

Firefighters returned to the scene Friday night after some smoke could be seen coming from the roof, making sure all hot spots have been put out.

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