Luxury condominiums collapsed in a massive sinkhole in Orlando early Monday, USA TODAY reported.

Tony Cuellar, Battalion Chief of Lake County Fire Rescue, said 30 percent of the Summer Bay Resort had collapsed by early Monday. Dozens of people staying at the Clermont, Fla. condominiums had only 15 minutes to escape the collapse. Although no injuries were reported, most guests left all of their belongings behind -- including medications.

"My heart sunk. I was sick to my stomach," said resort president Paul Caldwell. "No doubt there would've been injuries if they hadn't gotten the building evacuated."

Firefighters moved quickly to go door-to-door in Building 104, assisting guests from the crumbling structure. The sinkhole is reportedly 50 feet in diameter and 15 feet deep.

"While you are running by, pieces of the building are falling down behind you," security guard Richard Shanley told reporters. "So you just do what you can and get out."

Shanley said some people were scared that the collapse would bring them down with the building.

"Kids were crying. They were saying, 'We don't want to get trapped here. Mommy, we're on vacation. We're here to have fun," he said. "This is not what we expected. We don't want to get trapped here.'"

According to Cuellar, there were 20 people staying at the resort during the incident. Altogether, the building has 24 units. After the building collapsed, guests were relocated to other buildings. The American Red Cross arrived at the scene and provided assistance.

This is not the only recent report of a sinkhole in Florida. Back in March, a 50-foot sinkhole opened up near a home in Tampa. Jeffrey Bush, 37, was sleeping in the home and declared dead. Sinkholes are caused by soft limestone disintegrating after mixing with acidic rainwater. Erosion can be aggravated by heavy rains, removal of groundwater, and development.