BEIJING, June 24  -- China's prosecuting organs have been urged to guard against prisoners seeking early release through bribery or on the pretext of poor health.

At a Tuesday meeting, Li Rulin, deputy procurator-general of the Supreme People's Procuratorate (SPP), urged prosecutors to focus on handling occupational crimes and called for effective measures to supervise key judicial procedures.

According to Li, prosecutors should stay on high alert when dealing with commutation, parole and serving a sentence outside jail for medical reasons, especially in cases concerning former high-level officials and having huge social impact.

The call followed an instructive document released in February by the Commission for Political and Legal Affairs of the Communist Party of China Central Committee that urged a crackdown on judicial corruption following a number of convicts bribing their way out of jail.

In one high-profile case, Zhang Hai, former board chairman of Jianlibao Group Co., Ltd., a Chinese beverage giant, used illegal means, including bribing prison and justice officials, to have his sentence cut by five years in a second court trial and had his jail term further reduced by more than four years while he was serving the sentence.