Chinese Premier Wen Jiabao has ordered government departments to launch a thorough probe into a fake drug incident, which claimed five lives, and intensify rectification of the pharmacuetical market.

"The pharmacetuical market is in disorder," Wen said. In response to his instruction, a joint investigation work group will head for northeast China's Heilongjiang Province on Saturday to investigate the case.

The investigation team consists of officials from the Ministry of Supervision, Ministry of Public Security, Ministry of Health and the State Food and Drug Administration.

"The team will work with the provincial government to find out the cause of incident as fast as possible, penalize criminals in accordance with law and severely punish revelant people," said a member of the investigation work group.

He said results of the investigation will be made public in due time.