The scene looked dramatic enough: large pieces of scaffolding, foam and hundreds of metal wires hung precariously from the ceiling of the Ontario Power Generation Building after a large part of the roof collapsed Wednesday morning.

A “sagging” part of an overhanging roof came down around 10:30 a.m at 700 University Ave, blocking off an entrance that is commonly used by the thousands of employees in the building.

There were no injuries reported.

The area had been cordoned off two days ago after maintenance workers noticed there were “structural integrity” issues with this portion of the ceiling, said OPG spokesman Ted Gruetzner.

“The building staff noticed there were issues with the drywall structure on the soffit,” said Greutzner. “They notified building management, who took the steps to block off the area,” he said.

A further investigation will take place, but Greutzner said the collapse was not structural.

“It’s not a structural part of the building, it’s essentially dry wall and dry wall hangers. It’s not concrete.”

Many of the employees inside the building seemed unaware of the accident, but said they often used the exit where the collapse took place, although it was closed on and off over the past few weeks.

An area construction worker said he saw a portion of the roof had been sagging all morning. The area had been cordoned off, but he said he was surprised it hadn’t been better protected.

Police said there were no immediate plans to evacuate the building. The Bank of Montreal in the building was shut on Wednesday and the employees had been evacuated as a precaution.

City of Toronto building inspectors were on scene to ensure the rest of the building was safe.