Prosecutors said Katayama used Internet message boards to infect PCs with viruses enabling him to control them remotely and send e-mail threats, including a bomb threat that forced a
They said they had detected traces of the remote-control virus in a PC at an information technology company where Katayama had worked and that Katayama visited a location where a memory device containing the virus was found.
But no material evidence has been found. Katayama has persistently denied his involvement in the alleged crime since his arrest last February.
Before his arrest, police wrongly arrested four other persons whose computers were remotely used to issue threats by e-mail.
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