Virus writers have been sending emails with a story that use the following words, hoping to get people interested enough to click on the links:
The exact story they came up with doesn’t really matter. If you click on the link it tries to download a file called fbi_facebook.exe. This is the part that installs the virus on your PC.
Always be wary of sensational stories arriving by email (they’re almost always malicious). And be extremely wary of any links that try to download something that ends with .exe