Scrambling to safety in Chile. Aftershocks keep rescue crews on their toes.

Three days after the devastating earthquake struck Chile, the country is still reeling from frequent and powerful aftershocks. One strong tremor was felt Tuesday morning during a police news conference in the hard-hit town of ConcepciĆ³n. CNN cameras were rolling on a group of rescue workers as the building the crew was searching began to shake. Rescuers quickly began jumping from a hole carved in the side of the 15-story building, where some people are feared trapped.