At least one person has died when a multi-story building partially collapsed in southern Florida’s Miami-Dade County early Thursday morning, authorities said.

Local hospitals have received at least three patients, and two are critically injured.

The building, which appears to be residential, is located in the small, beachside town of Surfside, about 6 miles north of Miami Beach. A massive search and rescue operation was underway before dawn, as crews carefully checked the wreckage and remaining structure for survivors. Footage from the scene showed firefighters pulling a boy from the rubble alive and rescuing other people from balconies.

The Miami-Dade Fire Rescue said it has sent more than 80 units to the scene. Multiple police and fire departments from across Miami-Dade County have been deployed to assist, according to the Miami Beach Police Department.

Witnesses told Miami ABC affiliate WPLG that more people are still trapped inside the building.

People in neighboring buildings have been evacuated to a nearby recreational center, one witness told ABC News.

Further details on the incident were not immediately available. It was unknown what caused the collapse.