Officials are investigating a hacking incident against the U.S. Central Command's Twitter and YouTube accounts. The hackers claimed to be aligned with ISIS militants. They took control of Centcom's social media accounts today, posting alleged phone numbers of top military officers and what they said were classified documents. The White House said it was looking into the hack, but didn't have much information on the incident. A Pentagon official also said the information posted didn't appear to be highly classified documents.