Radiation leak at North Korean nuclear test site 'inevitable', says Chinese expert

A radiation leak at the site of North Korea’s massive bomb test is “inevitable”, a Chinese nuclear weapons expert warned, after authorities in China reported that the mountain where the explosion took place had collapsed. China’s Earthquake Network Centre said a second 4.6 magnitude ‘earthquake tremor’ happened eight minutes after Sunday’s initial explosion, which measured 6.3 magnitude. Authorities in China said the tremor could be a result of a &l