A woman had to be resuscitated late Monday after being found by firefighters unconscious in a smoke-filled apartment downtown.

Calgary Fire Department was called to the 200 block of 5th Avenue S.E. about 11 p.m. Monday and arrived to find smoke coming from a suite.

Firefighters forced entry, where they found a woman unconscious.

She was resuscitated and transported to hospital in stable condition.

Investigators are looking into the cause of the fire.