The building, situated next to a popular hotel in Phase 2, Site 2, Sultan Dasuki Way in the satellite town, was originally a hotel before being converted into a hospital.
After the hospital owners vacated the premises, it was, again, converted into a residential apartment.
Two people were rushed to a nearby hospital, while a few others managed to escape.
One of the escapees, who pleaded to be anonymous, stated that she woke up around 7 a.m., and upon stepping outside, she heard cracking sounds and immediately ran out.
Security operatives have moved to the scene to avert a breakdown of law and order while assisting medical workers in the rescue mission.