A disgruntled ex-convict, arrested for the recent serial bomb blasts targeting China's ruling Communist Party's provincial headquarters in Taiyuan, carried out the attack to "take revenge on society", police said on Friday.
One person was killed and eight others injured when a series of home-made bombs packed with ball bearings exploded in front of a provincial office of the ruling Chinese Communist Party, two days ahead of the party's key meeting to finalise political and economic reforms.