I just saw this report, and I assume that it has come from a reliable source:
THE FBI is warning computer users against unsolicited emails purporting to show photos or videos of the killing of Osama bin Laden.
The bureau says they may contain a virus that can steal personal identification information or infect a computer. In a statement today, the bureau cautioned that such malicious software can even be passed along unknowingly by a friend or family member.
The FBI urged the public to adjust privacy settings on social networking sites to make it more difficult for people to post material.