He reportedly tied up the eight staff members who were on duty at that time and then went on a rampage, stabbing 45 patients as they lay in their beds. The dead include 10 men and nine women ranging in age between 19 and 70. Among the 26 injured, 20 are said to have serious injuries, including deep stab wounds to the neck, and were being treated at local hospitals.
After the attack, Uematsu drove himself to the local police station, where he turned himself in. “I did it,” he told police. "It's better that disabled people disappear," he continued. He had three knives with him, at least one covered in blood, and tie cables in his car. He was immediately arrested on suspicion of attempted murder and unlawful entry to a building.
A message posted on a Twitter account after the attack apparently belonging to the suspect showed a photo of a smiling man with dyed blond hair, who was wearing a suit. "Wishing for world peace. beautiful Japan!!!!!!," the tweet read. Local reports said the man who carried out the attack had dyed blond hair.
The attack has left this rural area in shock, but was apparently not entirely without warning.
In February, Uematsu took a letter to the speaker of the House of Representatives in which he threatened to carry out the attack.
"I will carry out a massacre without harming the staff," Uematsu wrote in the letter, according to Kyodo News, which published a photo of the letter. "I will kill 470 disabled people. My goal is to euthanize, with their guardians' consent, seriously disabled people if they can't live at home or be active in society," he wrote, referring to the center by name. "I will carry it out at night time, when there are fewer staff on duty," he wrote.
NHK, the public broadcaster, added that Uematsu had also told his colleagues in February that seriously disabled people had no use for life and should be euthanized, leading them to call the police.