Youtube had a good description:
"The killer posted warnings on the internet: "A disaster in Akihabara" and wrote that an incident would take place on June 5. Kato was heavily into comic-book and video-game subculture.

He admitted to police that he documented his journey on Internet bulletin boards were posted from his mobile telephone,"I'll crash my vehicle into people and if the vehicle becomes useless, I'll get out a knife. Goodbye everyone!" said one posting hours before the crime, as quoted by Japanese media.

As a result, Seven people have been killed and more than 17 injured after a 25 year old Tomohiro Kato, ploughed into pedestrians with a rented two-tonne truck before jumping out and stabbing people downtown Tokyo. Six men and one woman died.

Online discussion board:

5:21 a.m. Sunday morning, "I'm going to Akihabara to kill people. If my car is destroyed I'll use a knife. Goodbye everyone." and then seconds later, "I'm tired."
6:31 a.m., "It's time, I'm leaving."

9:48 a.m., "I've entered Kanagawa. I'm taking a rest."

11:45 a.m.: "I've reached Akihabara. Today it's a pedestrian area, I think."

12:10 p.m., "It's time."


The latest stabbing occurred on the anniversary of one of the country's worst stabbing crimes, when eight children were killed at a primary school Osaka in 2001.

Japan has the highest suicide rate of any developed nation. In 2006, just over 32,000 people killed themselves -- approximately 87 people per day. While many commit suicide alone, in the last few years group suicides have become more common. The disillusioned often meet up online, make a plan to meet somewhere, and then kill themselves together.: