BEIJING, China (CNN) -- China has recalled two tainted leukemia drugs tied to "adverse reactions" in patients, the state-run Xinhua news agency reported Sunday.

The factories involved in the production of the tainted drugs have been closed for investigation.

According to Xinhau, the State Food and Drug Administration and the Ministry of Health suspended the production, sale and usage of methotrexate and cytarabin hydrochloride, produced by Shanghai Hualian Pharmaceutical Co., on September 5.

There is no indication the drugs in question were ever exported outside of China.

On Friday, the two agencies issued a notice saying that vincristine sulfate was the culprit -- an anti-cancer medicine which had been mistakenly mixed with the leukemia drugs, causing leg pains and retention of urine -- Xinhua reported. The factories involved have been closed, while the cause is being investigated.

Separately, China returned to U.S. and Canadian exporters 42 tons of pork and turkey products after samples of the pork in the shipments showed traces ractopamine, Xinhua reported.

Ractopamine is a hormone used to promote lean meat growth in some animals and is banned in many parts of the world, including China and the European Union. E-mail to a friend
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