The city fire department is trying to figure out what sparked an overnight fire in Manhattan that left multiple firefighters hurt.

The flames started around 1:20 a.m. Friday at 346 Broadway in TriBeCa, a building that is now under construction.

It took more than a hundred firefighters to get the fire on the 10th floor under control by 1:53 a.m.

Five firefighters suffered minor injuries in the process, officials said.