BOSTON (WHDH) — Fire crews are on the scene a six-alarm blaze at an apartment building under construction in Boston’s Dorchester neighborhood.

The fire broke out Wednesday afternoon at around 3 p.m. on an upper floor of the vacant building on Dorchester Avenue, which is located in the Ashmont area.

Video from Sky7 showed flames shooting from the roof and heavy black smoke billowing into the air.

Boston Fire Commissioner Joe Finn is asking residents to stay in doors and to avoid the area.

A section of the roof has started to collapse, according to Finn. Crews fear the collapse could worsen and they are taking precautions.

Boston Fire tweeted a photo just before 8:30 p.m., noting that there was “no roof” in the photo.

Because the building is still under construction, the sprinkler system is not active.

The building, which is built with a wood-frame, was slated to be inspected in a week and was in the process of booking tenants for a July opening.

The cause of the fire is not clear. Crews are still at the scene as flames continue to spread.

No firefighters have been injured. One construction worker suffered minor injuries when he complained of chest pains.

The MBTA says the Ashmont station has been closed.

Boston Fire says that the section of Dorchester Avenue from Ashmont Street Street to Washington Street, where the building is located, will most likely be closed the entirety of Wednesday night.

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