'Trade Center virus' circulating by e-mail

Hackers have circulated a computer virus purporting to be information about the World Trade Center.

The virus, dubbed "WTC", is a version of the Life Stages virus, which crashed computer systems around the world in June last year.

It arrives via an e-mail attachment, which if opened leaves behind documents and sends itself to others listed in the recipient's e-mail address book, slowing or crashing a computer system.