PHOTO: A man in his 70s was critically injured in a northwest side fire Friday. According to Tucson Fire, the call came in from the 1200 block of West Florence Street at 7:17 a.m. Crews including 13 units and 28 firefighters were at the scene within five minutes. The fire was under control within 11 minutes. Firefighters found the victim unconscious in a commercial building with an attached residence. The cause of the blaze is under investigation.