A 30-year-old man arrested for allegedly making online threats through hijacked personal computers told the Tokyo District Court on Tuesday he was not involved in the high-profile case.
"I have nothing to do with the case," Yusuke Katayama told a session in which the court explained the reason for his detention.
The threats — including one to attack a kindergarten and another to engage in mass murder — caused four users of hijacked PCs to be wrongly arrested between July and September.