NANNING - ?Four primary school students were killed in a knife attack in south China's Guangxi Zhuang autonomous region Friday morning, local authorities said.

The four kids in Pingshan town of Lingshan county were attacked by a knife-wielding middle-aged man at about 6:20 am while en route to the Gupu primary school, the county public security bureau said.

Three kids died at the scene and one died later at a nearby hospital.

Police have launched a manhunt for the suspect.

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