FDNY firefighters were desperately searching for survivors in a partial building collapse in Brooklyn where one person has died and at least 10 people were injured Wednesday, officials said.

Rescuers were painstakingly combing through the debris as they searched for additional survivors in the rubble of 1321 and 1323 Flatbush Ave. — two three-story, mixed-use buildings in Flatbush — where the collapse occurred shortly after 4 p.m., police said.

As the search continued, one frantic man told an ABC Eyewitness News reporter that his pregnant wife was inside the building when it collapsed, and he’s been unable to get a hold of her. It was not immediately clear if the woman was among the injured.

At least one person is still reported missing, officials said.

A section of one of the buildings appears to have sheared off, exposing the rooms inside, helicopter footage from ABC Eyewitness News shows.

The building that collapsed had been perched at the edge of a lot at 2625 Bedford Ave., where another one-story building had been torn down for a construction project. The site was being excavated, and the building that fell down filled the construction pit with bricks and wood.

Another building that shared a wall with the collapsed structure remained standing, but its wall was shorn off, exposing the rooms inside, including a bedroom and closets filled with clothing.

Firefighters were digging by hand, tossing chunks of rubble aside. Rescuers also used dogs to sniff for survivors. As darkness fell, firefighters used flashlights to illuminate the area where they worked.

So far, all of the injured are construction workers at the site, officials said. Besides the worker who died, four workers are critically injured, officials said. Six others suffered minor injuries.

The five injured people were taken to Kings County Hospital.

News helicopter footage showed dozens of firefighters homing in on one area and appearing to use a saw to cut through the wreckage.

A drone flew overhead and firefighters shone flashlights on the debris as night fell over the rescue operation.

The aerial videos showed firefighters digging at least one person out of the rubble and removing them on a stretcher.

According to filings with the city’s Department of Buildings, the construction crew was in the process of building a nine-story building with a cellar.

Public Advocate Jumaane Williams said there were concerns from the community about the site. The lot had been empty for some time.

With News Wire Services

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