Six workers who were trapped when a roof collapsed at a Glendale construction site Wednesday morning were rescued by firefighters.

The incident was reported around 11 a.m. in the 1200 block of Glendale Avenue, according to the Glendale Fire Department.

Firefighters at a nearby station heard a loud rumble and were able to get to the scene quickly, Anita Shandi of the Glendale Fire Department told KTLA.

They found that the metal roof trusses of a movie studio under construction in the area collapsed for an unknown reason.

Three workers were trapped in a lift about 40 feet in the air and firefighters were using an aerial ladder to try and reach them, video from Sky5 showed. Three others were on the ground when the collapse occurred and were stuck under rubble.

As of 1:20 p.m. four out of six workers had been rescued, but two were still trapped, officials said.

Around 10 minutes later, the remaining two had been rescued, thanks to aerial resources from the Los Angeles Fire Department. Five were taken to a hospital in stable condition, while the sixth refused transport, Shandi said.

Worker Lorenzo Dominguez was inside the building when the collapse occurred. He said everyone just ran.

“We were able to run out of there and it came pretty close to us. We were just blessed to get out of there,” Dominguez told KTLA.

He added that he was happy everyone who was stuck was OK.

“We got very lucky today,” Dominguez said.

The Burbank, Pasadena and San Marino fire departments also responded to the scene to help.

The cause of the collapse will be investigated by building and safety officials, Shandi said.