Security camera footage greatly assisted police investigating online threats sent via remotely controlled computers, enabling them to identify a suspect just six days after they found evidence on Enoshima island in Fujisawa, Kanagawa Prefecture.

Yusuke Katayama, a 30-year-old man living in Koto Ward, Tokyo, was arrested Sunday on suspicion of interfering with the activities of a major Tokyo comic book show. Katayama, an information technology company employee, is alleged to have sent a murder threat from a remote-controlled computer at a Nagoya company.

To arrest Katayama, police utilized not only conventional investigation methods, but also relied on lessons learned from the mistaken arrests of four men whose computers were used to make threats, according to investigation sources.