NEW YORK >> A six-story corner of a Bronx apartment building collapsed this afternoon, leaving apartments exposed like a stack of shelves, as firefighters scoured the mound of rubble to ensure no one was trapped.

There were no reports of injuries as of early evening.

“Our main objective is to get to the bottom of that pile,” Fire Department Chief of Department John Hodgens said at a news conference. “We’ll be here until it’s down to the street level, just to make sure if there are any victims under there, hopefully we can get to them in time.”

Officials were looking into what caused the collapse, which happened at a six-story, 1927 building that had been undergoing facade repairs.

A worker at a nearby deli, Julian Rodriguez, said he was behind the counter when he heard people screaming about a building collapse.

“When I went outside, all you could see is the debris and a smoke cloud in the street,” said Rodriguez, 22. “And you could see inside the structure: people’s beds, their doors, closets, lights, everything. It was really scary.”

A corner of the building stood with its walls sheared off and floors sagging, with a heap of debris spilling out into the street. In one apartment, a bed stood feet away from the edge of a floor that now jutted out into the air; in another, art hanging on the wall was visible. Elsewhere, an armchair rested on a floor that tilted precariously down, like the top of a staved-in box.

Firefighters shined bright lights into apartment windows from high ladders and used at least one drone to peer in. A search dog plied the pile, which included twisted and jumbled metal, apparently from scaffolding, and a robotic dog also headed into the debris.

Firefighters carted away rubble in buckets and used circular saws to cut through the collapsed scaffolding, and an excavator clawed through the rubble.

“We’re tunneling into that debris pile as safely as we can,” Hodgens said. “Firefighters right now are in a dangerous position. We don’t know what caused this corner of this building to come down. We don’t know if any of it is going to come down.”

A 2020 inspection found cracked brick and loose, damaged mortar on the building’s facade, Buildings Department records show. Commissioner Jimmy Oddo said Monday that work had started but he didn’t believe any workers were there at the time of the collapse.

“I want to be clear: Unsafe facade conditions is not the same as an unsafe building,” he said at the news conference. While the property had seven unresolved violations, they weren’t structural, he said.

Oddo said officials would scrutinize drawings pertaining to the collapsed area. The images were submitted as part of permitting for the facade work.

The phone rang unanswered at a possible number for the building’s owner.

Buildings Department records show the structure has nearly 50 apartments. Residents were being directed to a school to get help, and the city was parking buses near the building as a place to stay warm.