A knife-wielding man went on a rampage early Tuesday at a care facility for people with disabilities in Sagamihara, Kanagawa Prefecture, killing at least 19 people and wounding 25 others, 20 of them seriously, in one of the worst mass killings in modern Japanese history.

The Kanagawa Prefectural Police arrested Satoshi Uematsu, 26, after he drove to Tsukui Police Station and turned himself in at around 3 a.m. Tuesday, about 15 minutes after staff at the Tsukui Yamayuri En (Tsukui Lily Garden) facility had called police.

Police quoted him as saying, "I did it."