Several of the children are in a critical state , state media report . The attack took place Friday morning at a primary school in Henan province . Police say they have detained a 36-year-old local resident . A man who was injured during an explosion outside a primary school has died, China's state-run Xinhua news agency reported on Saturday.
Several of the children are in a critical state , state media report . The attack took place Friday morning at a primary school in Henan province . Police say they have detained a 36-year-old local resident . China was hit by a spate of knife and cleaver attacks on school children in 2010 .