China is investigating a second former top military officer on suspicion of corruption, two independent sources said, as President Xi Jinping widens his campaign against deep-rooted graft in the country.
Guo Boxiong, 72, was a vice chairman of the powerful Central Military Commission until he stepped down in 2012. Another former vice chairman, Xu Caihou, was put under investigation last year for corruption.
Before their retirement, the men had been two of China's top military officers who served together under Xi's predecessor, Hu Jintao. Xi was also a vice chairman with Guo and Xu from 2010-2012, before he became head of the party and military commission chief.