Computer experts and World Cup football organizers have issued a warning about a computer virus spread through fake e-mails. It tells fans they have won tickets to the 2006 tournament in Germany.

The e-mails try to convince recipients to click on an infected attachment containing the virus, Worms--Sober.S, in order to win tickets. Computer users were warned Tuesday to avoid opening attachments coming from senders with addresses such as "" or ""

The virus can travel in both English and German language e-mails as a malicious attached file. The e-mail appears credible because it contains correct contact information for FIFA.

It is still unclear what happens when the attachment is opened, but computer security experts believe it has already attacked computers in Germany, Austria, the United States and Switzerland.

Some information for this report provided by AP and AFP.