Local government officials have identified the suspect in the knife attack as Satoshi Uematsu.
A Kanagawa prefecture official told a news conference that Uematsu entered the building about 2:10 a.m. by breaking a glass window on the first floor of a residential building at the facility for the handicapped.
Shinya Sakuma, head of prefectural health and welfare division, said Uematsu had worked at the facility until February. Japanese media reports said he is 26 years old.
The Sagamihara fire department has said 19 people were killed in the attack Tuesday morning.
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