Private milk collecting stations were likely at fault for a rapidly unfolding scandal over tainted infant formula that has left two babies dead and nearly 600 ill, Chinese officials have revealed.
All 19 people detained so far in a nationwide probe into how the chemical melamine came to contaminate the formula are from the stations, which pick up milk from dairy farmers, the state-controlled China Daily said.
"It's unlikely that dairy farmers mixed the industrial chemical melamine in fresh milk," it quoted Li Changjiang, who heads the General Administration of Quality Supervision, Inspection and Quarantine, as saying.
He added: "We believe the contamination is more likely to have occurred at milk collecting stations."
This is in contrast to initial statements from Sanlu Group, the company at the centre of the scandal, blaming "defective" fresh milk supplied by farmers for the contamination, the paper said.
Melamine, which is used for making plastics and glues, may have been added to make the milk appear it contained more protein than was actually the case, Chinese media have suggested.
Xinhua news agency said Monday that two babies, both in northwest China's Gansu province, had been confirmed dead after drinking the contaminated milk powder, up from the one fatality reported earlier by health authorities.
Nationwide the number of babies sick with kidney stones after drinking the formula has risen to about 580, up from 432, the China Daily said.