Transcript for 20 schoolchildren in China injured in attack

When he children were hurt in a school attack in China unmanned employed as a maintenance worker at the primary school in Beijing began hitting kids without hammer. Three of the students have series but not life threatening injuries. His contract was set to expire this month and had not been renewed the children are being treated in a nearby hospital and are expected to recover.

This transcript has been automatically generated and may not be 100% accurate.