An early morning fire in an abandoned building has closed southbound traffic on Fort Road at 129 Avenue.

Fire crews remain on scene, working to eliminate hot spots.

The cause of the fire is not yet known. Investigators will access the site once the fire is fully extinguished.

Eight crews – 32 firefighters – were on scene early Tuesday morning.

"Our first crews arrived around 4:40 a.m.," said District Chief Tim Famulak. "There was really heavy smoke showing from the rear. They were unable to get in very far before command pulled them out because the roof had been breached."

No side buildings have been damaged and no one was evacuated from the area.

The abandoned building was reportedly a former deli, which closed in 2008.