He said: ” I did it.”The killer is reported to have said he wanted people with disabilities to disappear. Uematsu had a bag full of knives and other edged tools. He was arrested on suspicion of attempted murder and unlawful entry to a building. Some months ago he sent a handwritten letter to politicians in which he threatened to kill hundreds of disabled people. No one believed. Now, the suspect broke a window to get inside and then began stabbing people. The facility for the disabled located about 50 kilometers from downtown Tokyo can accommodate up to 160 people.The police are investigating the motive behind the attack. The incident in Sagamihara is the worst mass killing in decades in this country.