As Japan grappled with shock Tuesday following a mass murder carried out by a lone intruder at a care facility for disabled people, employees at similar facilities expressed concerns about their security as the industry is plagued by a shortage of workers.

"I did not expect something like this to happen," the director of a care facility in Tokyo said. "We don't have a special security guard, and our staff at night is usually shorthanded. They were usually busy handling a heavy workload at night."

At around 3 a.m. Tuesday, Kanagawa Prefectural Police officers arrested Satoshi Uematsu, 26, after he turned himself in and said he committed the stabbing rampage at the Tsukui Yamayuri En (Tsukui Lily Garden) care facility in Sagamihara.