Amid reports that the email addresses obtained by iPad hackers included those of high-ranking government officials, the FBI has launched a probe into the security breach. The hacker group calling itself Goatse Security obtained a list of more than 100,000 email addresses that included politicians, CEOs and celebrities. "The FBI is aware of these possible computer intrusions and has opened an investigation to address the potential cyber threat," a spokesman for the bureau told Reuters. (More iPad stories.)