At least 15 people were killed and more than 40 others were injured on Monday night after a former employee went on a stabbing rampage inside a facility for people with disabilities in the Japanese city of Sagamihara, west of Tokyo, reports BNO News.

The attack happened at about 2:30 a.m. local time and is believed to have been carried out by a lone knifeman.

The attacker reportedly went to a police station and confessed.

The suspect was identified as a man in his 20s who previously worked at the facility. There was no word on a possible motive.