krebsonsecurity writes: The City of Norfolk, Virginia is reeling from a massive computer meltdown in which an unidentified family of malicious code destroyed data on nearly 800 computers citywide. The incident is still under investigation, but city officials say the attack may have been the result of a computer time bomb planted in advance by an insider or employee and designed to trigger at a specific date, according to krebsonsecurity.com. "We don't believe it came in from the Internet. We don't know how it got into our system," the city's IT director said. "We speculate it could have been a time bomb waiting until a date or time to trigger. Whatever it was, it essentially destroyed these machines.