Police in Italy have begun seizing 30m litres of baby milk produced by Swiss food giant Nestle after tests suggested possible contamination, the BBC reported.

The forestry police say a chemical involved in the printing process was found in the milk.

It was not immediately clear if the product was toxic, and the risk to a child's health is disputed.

Nestle said it was recalling all the milk products for which concerns had been expressed.

The scare began in June when a sample of baby milk produced by Nestle showed traces of isopropyl thioxanthone, a photographic chemical known by the initials ITX, the BBC said.

The chemical is used in the printing process of the milk cartons, but appears to have made it into the baby milk itself, our correspondent says.

Italy's forestry police, who are responsible for agriculture, became involved in October because of a perceived lack of action.