Chicago fire crews rescued a worker who was trapped after a three-story building partially collapsed Thursday morning in the city's Bronzeville neighborhood.

Three people were working at the vacant building that was under construction around 11 a.m. when the collapse happened, fire officials told FOX 32 Chicago.

Crews found the worker under a pile of debris roughly 3 to 5 feet deep and were able to free him before noon. 

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Chicago building collapse one

Person trapped following building collapse in Chicago has been pulled out. (Chicago Fire Department)

Chicago building collapse seen from the air

A Chicago building collapse trapped a man, who was freed from debris by firefighters but remains in grave condition, Thursday, Jan. 12, 2023. (WFLD Fox 32 Chicago)

The worker was taken in an ambulance to University of Chicago Medical Center in grave condition.

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The cause of the collapse was not immediately clear.