Local police on Friday detained a 41-year-old ex-convict who "took revenge on society" by setting off deadly explosions in Taiyuan, capital city of North China's Shanxi Province, on Wednesday.

One person died and another eight were injured in the explosion.

The suspect, Feng Zhijun, a local resident of Taiyuan, admitted to having intentionally committed the crime in order to "take revenge on society" after his capture at 2 am on Friday, according to a statement from the Shanxi Provincial Public Security Department.

He also confessed all details of his crime, police said.

The explosions occurred on Wednesday morning in front of the office building of the Shanxi Provincial Committee of the Communist Party of China in Taiyuan. Among the eight injured, one was seriously wounded.

Police found self-made bombs in Feng's residence and seized the vehicle which they believe he was using at the time of the explosions.

Feng had previously served nine years in prison for theft, police said.

The case is still under investigation.