By Ian Johnston, Staff Writer, NBC News

CLERMONT, FL (NBC) - A 40-foot-wide sinkhole caused a three-story building at a Florida resort near Disney World to collapse early Monday.

Everyone in the building was evacuated safely before part of it collapsed.

Firefighters arrived at the Summer Bay Resort, near Clermont, at about 11:30 p.m. ET after people reported the building had started to shake, Lake County Fire Rescue's Battalion Chief Special Operations Tony Cuellar said.

Cuellar said the sinkhole was beneath a central elevator shaft connected by breezeways to two apartment blocks.

"The building on the west side … a portion of that structure just collapsed. It's literally breaking in half," he said at about 3:20 a.m. ET.

The elevator building was leaning over at "about 30 or 40 degrees," Cuellar said.

He said 20 people had been living in the building but it had been evacuated and everyone was accounted for. A nearby building with 16 people in it was also evacuated. No injuries were reported.

Cuellar said the hole was about 10 feet deep and 40 feet in diameter.

"It's not expanding outward so we're just watching it to see if it's sinking downward," he said.

The resort - about 10 miles west of the Disney attraction – had made 50 other rooms available to the evacuees, Cuellar added.