Rescuers tunneling Friday into the rubble of the eight-storey building that collapsed Wednesday discovered another 50 people trapped on what remained of its third floor, an official said. Bangladesh Fire Service Deputy Director Maj. Mizamur Rahman said rescuers were hoping to free them within a few hours. As the effort was under way, they dropped food and bottled water to those who called out. Also Friday, a woman who gave birth under the debris was rescued, along with her infant, a fire service official said, according to the state-run news agency Bangladesh Sangbad Sangstha (BSS). At the rescue site, the death toll from the collapse rose Friday to 307. "Our prime target is to rescue the rest of the survivors alive, as we are running against time," a military spokesman told reporters more than two days after the incident, CNN cited BSS as reporting.