Fire crews battled a three-alarm fire that broke out in Corktown Thursday night.

The fire started around 8:30 p.m. in a two-story townhouse at Queen St. E. and Sumach St. There was heavy smoke and flames as three aerial ladders, 20 trucks and 70 firefighters came to the scene.

The blaze has spread to buildings on either side, but Toronto fire said they have been evacuated and there is no indication that anyone is still in the buildings.

Toronto Fire Services Chief Matthew Pegg told reporters at the scene that a firefighter injured his leg after falling down a staircase.

Capt. Adrian Ratushniak told the Star that the firefighter went back to work after he was treated by paramedics at the scene. No other injuries were reported.

“With this size of a fire involving multiple buildings were going to be remaining on scene because there might still be hot spots and then investigators have to go in and determine the cause,” said Ratushniak.

Crews took a “defensive attack” to the fire since it was not safe for firefighters to enter the buildings. It was not known how many businesses or residents have been affected.

Pegg tweeted just before midnight that the fire was under control. Investigators have been called to the scene to determine the cause and origin of the blaze.

Queen St. was closed in both directions from Power St. to River St. for the investigation but it has since reopened.