Beijing ? Chinese authorities have found dairy products in at least two provinces tainted with an industrial chemical that killed six babies and sickened thousands more in 2008, state media said today.

The discovery suggests toxic milk remains a lingering danger in China despite a crackdown two years ago that saw dozens arrested and two people, a dairy farmer and a milk salesmen, executed.

Some of the recently found milk was powder that state media said was likely stockpiled instead of destroyed two years ago.

Melamine is added to watered-down milk to make it appear rich in protein in quality tests that measure nitrogen, found in both the melamine and protein. Health problems from the chemical include kidney stones and kidney damage.