KARACHI: Muhammad Imran did not take the fire seriously at first, thinking it was another small spark at the Karachi mall that would be quickly extinguished by fellow shop owners. But smoke seeped through ducts and blackened the air in seconds. The lights went out soon after and phone flashlights turned useless, people could no longer see their own hands, he said. Imran, who has diabetes and has undergone heart surgery, managed only a few steps before nearly giving up. “It felt like doomsday,” he said.