Mass school violence isn't limited to the USA:

The spate of stabbings began in March of that year, when a man in Fujian province went on a slashing spree outside a primary school, killing 8 and injuring 5. The attacker was a jobless doctor who reportedly was venting frustration after a failed romantic relationship. Over the next two months, four similar incidents took place in southern and inland China, leaving more than eight primary and kindergarten students dead and 57 injured. The timing of the four incidents suggested the possibility of a “copycat” phenomena, in which criminals mimic sensational incidents after learning of them from media. The stabbing spree alarmed government authorities, who enhanced security at schools; a Chinese regulation now also requires people to register with their national identity cards when purchasing large knives.

But schools are still coming under attack. Two months ago, three students were killed and 13 injured when a man with a machete rampaged through a private daycare center in Guangxi.