Two police officers have been jailed for 13 years in Henan for torturing a man to death while he was in custody, state media reported yesterday. Wang Wenping , the former director of a public security bureau in Hebi , and police officer Zhang Kefeng , were both jailed for their involvement in the death of Han Zhiqiang , a post office security guard. Two other police officers were jailed for 12 years and another for three years in connection with Han's death, Xinhua reported. Han was detained on March 23 last year after a robbery at the postal savings and remittance bureau where he worked. More than 140,000 yuan was stolen and police detained Han as a suspect. A Hebi court report said that on April 2 Wang ordered the other policemen to 'punish' Han and force a confession out of him. Han was reportedly tied up and beaten for more than an hour. He was beaten again three days later and fell unconscious. He was transferred to a hospital, where he died. A postmortem examination by the Supreme People's Court showed Han's death was linked to the torture. News of the convictions comes days after the state procurator announced it will be launching a year-long campaign this month to crack down on officials who illegally detain or torture suspects, and to inform people of their rights. Figures show that 1,408 civil servants were investigated on suspicion of abusing their powers and infringing human rights last year.