At least four people have been confirmed dead early Thursday in the horrific collapse of a Brooklyn building as rescuers continued the massive rescue operation for others still trapped.

At least 17 others have been wounded — four critically — after the side of the three-story building fell into an adjacent open construction site in Flatbush just after 4 p.m., according to the FDNY.

At least seven children are among the wounded.

One firefighter suffered minor injuries as 69 units and 250 fire and EMS personnel were scrambled to the scene on the corner of Flatbush and Bedford Avenues.

Officials warn others may still be trapped under the rubble, as crews use drones, buckets, and vacuum trucks to search through the wreckage.

This is a developing story. Please check back for updates.