Business owners at a Hazel Dell strip mall remained locked out of their stores Sunday following a three-alarm fire that affected nine businesses Saturday. Since the fire was extinguished, the roof of the strip mall partially collapsed. The collapse was a major reason the building was closed Sunday, said Clay Bond, a response coordinator with Fire Industry Restoration Experts. While no injuries occurred, firefighters fought the damaging blaze for more than 40 minutes at the Holly Park Shopping Center on Northeast Highway 99.