Rescue workers search the remains of an explosives factory in Caofan township of Zhangqiu city in east China&#x27;s Shandong province,  Monday May 20, 2013. A massive blast ripped through the explosives factory Monday in eastern China, killing at least 12 people and leaving others buried in the debris, state media reported. Rescuers were take care to avoid setting off additional explosions as they went through the site of the mid-morning explosion in Shandong province&#x27;s Caofan township, the China News Service said. The company website said the factory, run by the Baoli group, manufactures 10,000 tons of industrial explosives annually.