The baffled Metropolitan Police Department's hunt for an elusive cyber-riddler made progress Sunday after a Tokyo man was arrested on suspicion of making anonymous online threats last year by remotely manipulating other people's computers.
Yusuke Katayama, a 30-year-old resident of Koto Ward, was arrested Sunday morning but denied any wrongdoing, the police said. He has been charged with forcible obstruction of business for allegedly posting a threat online last August stating that mass murder would take place at a comic book event, forcing security to be tightened.
The case, which also involves cyberthreats against a kindergarten, resulted in the wrongful arrests of four people from July to September whose computers were infected by a virus used to send the messages.