Nineteen people who reportedly worked at milk collecting stations which provided milk to Sanlu Company have been detained in the wake of the tainted baby formula scandal. From the New York Times:

China said Saturday that 19 people had been detained by the police as part of an investigation into how baby formula had become contaminated with an industrial chemical. The formula is implicated in the death of one infant, and at least 432 others have been afflicted with kidney problems.

The government also said Saturday that the Sanlu Group, China’s biggest producer of milk powder formula, had first received complaints about its powder in March and had recalled some products but delayed reporting the problems to the government or the public.

More details from Xinhua:

Two brothers who had been selling three tons of contaminated milk per day have been arrested in north China’s Hebei Province in the wake of the Sanlu milk powder contamination scandal, local police said on Monday.

The brothers surnamed Geng, who had been running a private milk collecting station since May 2004, face the charges of producing and selling toxic and hazardous food, said Shi Guizhong, a police spokesman of Hebei Province.

[…] A total of 19 people from private milk collecting stations have been detained by police in Hebei in the milk powder contamination scandal. The Gengs were the first two to be arrested.