"There is no practicable, feasible, and concrete legal instrument" to regulate Internet use, says Li Xu, deputy head of Tsinghua University's Institute for Internet Behavior.

An automatic vibration performance test system based on virtual instrument technology for coordinator of homing head is introduced.

Professor Marianne Elvander, the institute's head of disease control and epidemiology, told the BBC News website that they appeared to have been hit by some kind of blunt instrument.