Five men armed with knives entered a vocational college Wednesday and attacked nine students in the southern province of Hainan, injuring one of them seriously, AP reported. Four students had been injured during a previous confrontation between the two groups. In the latter attack, one of the students’ hands was severed, but two students were also hospitalized with non-life-threatening injuries. The attack represents the ninth violent attack in China in the last two months, which some officials have attributed to the stresses of China’s rapid development. Over the course of the attacks, 17 people have died, including 15 children, and 80 more have been injured.