Two dairy firms accused of producing unsafe milk powder defended their products yesterday, as quality investigations continue.

The Shanghai municipal bureau of quality and technical supervision said on Wednesday that the bureau is looking into "the quality and safety of Dumex milk powder" produced by a unit of France's Groupe Danone SA.

The Mengniu Dairy Group Co, one of the leading dairy companies in the country, is being investigated by China's quality watchdog for an unapproved protein additive in one of its milk products.