At the beginning of last week somebody with the nickname “Mato” ( 殺す ) wrote a message in 2 Channel (the most visited forum / BBS in Japan) saying that he was going to kill people indiscriminately on the streets near Shinjuku station south exit on Friday (yesterday) at 9:00pm. The announcement quickly spread around Twitter and in just some hours everybody in Japan knew about it.
42 ：Mato：2011／02／06（日） 15：51：35
On February 11st at 9:00pm, in the south exit of Shinjuku station, near the bus stop I am going to kill three people. If you don’t want to die, don’t participate in the game. I am going to execute my plan no matter what happens. I really feel like I want to kill.
Yesterday afternoon, in Shinjuku station, there were more policemen and members of the Self-Defense Forces (Japan armed forces) than pedestrians.
Fortunately they caught the suspect that wrote the message on the Internet before he killed anybody. It turned out to be a 15 year old high school student!! No further information about the arrest has been released, only the suspect’s age.