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One person died and four others suffered serious injuries after a building collapsed at the edge of a construction site in Brooklyn, according to a senior official, which led to a frantic search by firefighters combing through large piles of rubble.

The collapse occurred around 4 p.m. Wednesday near the intersection of Bedford Avenue and Flatbush Avenue in the Flatbush neighborhood, the FDNY said. It was not known what caused or led up to the collapse.

The FDNY said two people were removed from the rubble soon after the collapse. Arial footage showed dozens of firefighters frantically searching for others, with at least two who were trapped in the wreckage. A senior city official later said those two were in the process of being extricated just before 5 p.m.

One person died as a result of the collapse, and four others were seriously injured, a senior city official said. One of the injured was in critical condition at Kings County Hospital.

Video from Chopper 4 showed firefighters pull an injured man from the rubble around 4:45 p.m. He was taken away on a stretcher.

The conditions of the others pulled from the rubble were not immediately clear.

The building that collapsed appeared to have been a three-story building with a business on the ground floor. It was located next to an excavation site after the one-story building that had previously been there was fully demolished.

The collapsed building 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.

The city’s Office of Emergency Management advised people avoid the area, as traffic delays and road closures could be expected.

A drone hovered over the site as firefighters dug 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. The senior city official said rescue operations were ongoing, with searches still being conducted.

Phone and email messages seeking comment were left with the architect, property owner and general contractor listed in city records as being associated with the construction project.

Multiple teams responded to the scene. An investigation into the collapse is ongoing. The Department of Buildings was at the scene.

The Associated Press contributed to this report.

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