Authorities said that twenty people were killed and 14 injured Friday in a massive blast triggered by oil that leaked from a truck in south China's Guangdong province The truck carrying 40 tons of gasoline collided with another truck at 4.30 a.m. on the Yanjiang Expressway in the provincial capital Guangzhou. After the crash, oil leaked and triggered an explosion. Sources said that most of the casualties were workers of the factory.