An investigation is underway after a building collapse Tuesday afternoon in Brooklyn.

The building is located at 1438 Fulton Street, at the intersection of Tompkins Avenue.

Fire officials say they got the call around 2:30 p.m. They say at least three people suffered non-life-threatening injuries. The four-story building was empty at the time of the collapse.

According to fire officials, reports indicate that the building was vacant, but emergency personnel are still searching.

The New York City Office of Emergency Management and the Department of Buildings say they are on scene.

One person who was nearby spoke with NY1 about what she saw. 

"I heard a bang. I looked out. I saw a school bus. I thought it was a big accident. Then I saw a cloud of dust and after the dust was cleared, I saw the bricks. It was like the cloud was raining bricks," said witness Ruth Leslie. "I thought it was 9/11 all over again. I never experienced anything like this."

Officials expect to be on the scene for anywhere from 48 to 72 hours doing a secondary examination of structural damage.

OEM says Fulton Street is closed from New York Avenue to Albany Avenue, and Tompkins Street is closed from Fulton Street to Macon Street. They advise commuters to expect traffic delays.

The MTA says the A and C trains are back to running on a normal schedule.