Story highlights Woman accused of placing rat poison and herbicide in yogurt

Among the sick children, three are in serious condition

None of the victims suffer life -threatening injuries

Nineteen school children in central China were hospitalized this week after consuming yogurt laced with poison, China's state run news agency Xinhua reported.

Among the sick children, three were in serious condition, the agency reported. But none of the victims suffered life threatening injuries, the agency reported.

The incident occurred Wednesday at a school in Hunan province, the news agency reported. A 34-year old woman has been detained and accused of placing rat poison and herbicide in the yogurt, Xinhua reported.