A 3-alarm fire at an industrial complex in Etobicoke sent a large, puffy trail of dark smoke across the Gardiner Expressway Saturday morning.

Fire broke out at a seafood plant at about 7:20 a.m. on Six Point Road, near Kipling Avenue and Bloor.

More than 50 firefighters battled the flames to get them under control, dousing the North Fish Co. Ltd. building with water from above using an aerial truck.

Toronto Fire Division Commander Bob O'Hallarn says by mid-morning, 4 sections of the building had collapsed thanks to the flames.

He expects crews to be there through the day making sure that all of the flames are out and that the building is safe.

"Its just far too dangerous for us to put any of our crews inside (the building) with the fact that the walls are collapsing, the ceiling is collapsing and the roof is collapsing," says O'Hallarn.

He said that an engineer will be called in to determine whether the building can be saved but O'Hallarn believes it will have to be demolished.

Nearby streets were closed off while firefighters fought the blaze and several other industrial units in the area were evacuated by police shortly after emergency crews arrived.

The fire happened outside of the plant's normal business hours and there is no word on a possible cause.

No injuries have been reported.

(With files from Justine Lewkowicz)