PORTLAND – Officials are investigating the cause of a fire that heavily damaged a Portland restaurant and an adjacent market and apartment house.

The three-alarm fire broke out late Sunday afternoon at Binga’s Wingas on Congress Street.

A cook at the restaurant said he saw smoke coming through the edges of the back door. When he opened the door, the back porch was on fire and flames made their way into the restaurant, he said.

Flames spread from the restaurant to an adjacent apartment building, which also houses the Al-Mustaqi Halal Market and butcher shop.

Officials said no serious injuries were reported, but two firefighters were hurt when they slipped and fell on the ice. One was treated at a hospital and released.