THE BRONX - A building partially collapsed on Wednesday morning in the Mott Haven section of the Bronx, with reports of a gas explosion in the ventilation shaft connected to the boiler in the building, the FDNY said.

What we know:

The partial collapse happened just after 8 a.m. at the NYCHA's Mitchel Houses complex located on Alexander Avenue. was over the 20-story building, with dozens of firefighters seen on scene assessing the situation.

The collapse appears to have taken out a large chunk of a corner of the building. Video shows emergency responders on the ground with dogs searching the rubble. Authorities said no residential units were affected. Image 1 of 5 ▼

The rubble pile was littered with air conditioners, which appear to have been ripped out of apartment windows by the

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