Police in China have arrested six people and detained 41 others suspected of distributing milk powder tainted with melamine -- the chemical linked to China's 2008 tainted-milk scandal.
Food safety authorities say police are investigating allegations that a dairy factory in northwestern Qinghai province shipped melamine-laced milk powder to neighboring Gansu province. Three of those arrested worked at that factory. The others are alleged dealers.
Police also seized more than 100 tons of dairy products from northern regions.
Six children died and more than 300,000 were sickened in 2008 by baby formula laced with melamine.
The government found melamine in the milk products of 22 dairy companies.
Chinese dairy products were recalled worldwide, causing huge economic losses for China and prompting the government to step up food safety controls.
Earlier this month, China's health ministry said it found no evidence that milk powder produced by the Synutra company caused three infant girls to grow breasts.
Some information for this reported by AFP, Reuters, Xinhua and Beijing News.