A Sunday attack in Akihabara
On June 8, 2008, Akihabara was crowded with shoppers when 25-year-old Tomohiro Kato drove a rented truck into pedestrians. Contemporary Associated Press and Los Angeles Times reports said he then left the vehicle and attacked people with a knife before police detained him only minutes later.
Seven people died. Reports at the time placed the number of injured at around ten or eleven, with totals varying slightly among early accounts. Because casualty figures can shift in the first hours after a mass-casualty event, this file uses the consistently established death toll of seven and describes the injury count conservatively.
Evidence of planning
Investigators examined internet messages believed to have been posted by Kato before the attack. Reporting by the Los Angeles Times and Japanese media described messages that announced an intention to go to Akihabara and kill people. These posts became part of the evidence that the attack was not simply an unplanned outburst.
Kato was arrested at the scene. His identity as the attacker was therefore not a long-term investigative mystery, and the criminal case focused instead on intent, responsibility, the scale of the offense and sentencing.
Trial and death sentence
Kato was prosecuted for murder and other offenses. The case moved through Japan's courts for several years. In 2011, the Tokyo District Court sentenced him to death, a sentence later upheld on appeal.
In February 2015, Japan's Supreme Court finalized the death sentence. The Japan Times reported that the court emphasized the deliberate preparation behind the attack, its grave consequences and Kato's criminal responsibility.
Execution in 2022
Tomohiro Kato was executed in July 2022. By that point the Supreme Court judgment had been final for more than seven years. The execution ended the penal process, although debate over Japan's use of capital punishment continued separately from the factual question of his guilt.
A June 2026 Japan Times report marking the eighteenth anniversary stated that Kato had been executed in July 2022 and that people continued to visit the Akihabara intersection to mourn the seven victims. That recent retrospective confirms the final status of the criminal case.
Impact and public memory
The attack shocked Japan in part because it unfolded in a busy commercial district associated with electronics, games, manga and youth culture. It also renewed public discussion about access to large knives, public-space security and online warning signs.
Those policy debates should not be simplified into a claim that one measure could have guaranteed prevention. The strongest documented facts are the attack itself, Kato's immediate arrest, the evidence of preparation, the convictions and the final death sentence.
Timeline
June 8, 2008: Kato drives a rented truck into pedestrians in Akihabara and attacks people with a knife; seven people are killed.
June 8, 2008: police arrest Kato at the scene.
2011: the Tokyo District Court sentences Kato to death after conviction.
February 2, 2015: Japan's Supreme Court finalizes the death sentence.
July 26, 2022: Kato is executed.
June 8, 2026: mourners mark the eighteenth anniversary at the Akihabara site.
Current status
The case is solved and fully adjudicated. Tomohiro Kato was convicted, his death sentence was finalized by the Supreme Court in 2015, and he was executed in 2022. Public memorials continue to commemorate the victims rather than the offender.