China's government has launched a yearlong crackdown on illegal additives in pig feed after some pigs owned by meat suppliers tested positive for a banned chemical that can be dangerous to humans.

Tainted pork has become the latest food safety scandal to shock China after state broadcaster CCTV ran an expose earlier this month showing that a subsidiary of China's largest meat producer, based in central Henan province, used pork tainted with the fat-burning drug clenbuterol in its products.

The Ministry of Agriculture said in a statement on its website late Monday that the crackdown would be a multi-agency effort.

The China Daily newspaper said Tuesday that 12 government officials in Henan were implicated in an investigation into the scandal.

Copyright 2011 The Associated Press.