The People's Republic of China has developed and possessed weapons of mass destruction, including chemical and nuclear weapons. China's first nuclear test took place in 1964 and first hydrogen bomb test occurred in 1967. Tests continued until 1996 when it signed the Comprehensive Test Ban Treaty (CTBT). China has acceded to the Biological and Toxin Weapons Convention (BWC) in 1984 and ratified the Chemical Weapons Convention (CWC) in 1997.