Four men went on trial Monday for being suspected of intentional injury causing death of a teenage internet addict in south China's Guangxi Zhuang Autonomous Region.

The four instructors at the Qihang Salvation Training Camp, namely Huang Yejian, Guo Zhicai, Wei Gaojian and Li Qunlai, used wooden boards, bamboo vines and other tools to beat Deng Senshan, a 15-year-old boy, in August last year, who was sent by his parents to the camp to kick his internet addiction but was disobedient, according to prosecutors.

Deng was found dead at about 3 a.m. on Aug. 2, just 14 hours upon his arrival at the camp.

An autopsy by the Public Security Bureau of Nanning City showed Deng suffered multiple soft tissue injuries on his body,and succumbed to the injuries which had caused breathing failure, plus a failure in the circulation system.

The unlicensed camp was closed five days' after the boy's death. And 122 other occupants on the camp, all under 18, were taken home by their parents.

The court did not produce a verdict Monday.