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The latest on national protests. Plus, what went wrong in Yemen rescue attempt?
(CNN) – Exactly how does the U.S. know North Korea is behind the Sony hacking?
For nearly a month now, the FBI has been back-tracking data released online, working to identify who put it there. Sources tell CNN that hackers stole the credentials of a Sony administrator, then went to town, lurking around the system for months and stealing information. And at times, the FBI even thought other countries like Iran and China might have been involved.
So what led U.S. intelligence to this point?
CNN chief national security correspondent Jim Sciutto reports for "The Lead."
Washington (CNN) - U.S. government officials are preparing to publicly blame North Korea for the Sony Pictures hack - but haven't yet decided how to respond to the attack.
The White House and other agencies are holding a series of high-level meetings to discuss the United States' range of options, a senior official in President Barack Obama's administration said.
"We do think it's appropriate to respond," the official said.
Those options could include new sanctions against North Korea, another source said.
(CNN) - The release of American aid worker Alan Gross as part of the U.S. and Cuba's historic shift in diplomatic relations was nothing short of splashy.
We saw photos of Gross getting off a plane and being greeted by loved ones, as well as meeting with Secretary of State John Kerry. The freed American even held his own news conference.
And yet, very little is known about the details surrounding the other prisoner released from Cuba as part of this deal.
(CNN) –Today's massacre of defenseless school children in Peshawar was carried out by the Pakistani Taliban in retaliation, the group says, for the killing of hundreds of innocent tribesman in north and south Waziristan by the Pakistani military.
CNN's chief national security correspondent Jim Sciutto looks into the group and the threat they might also pose to the United States.
Kuwait City (CNN) – Defense Secretary Chuck Hagel said Tuesday the military is prepared to handle any potential fallout from the impending release of a Senate panel's torture report.
All U.S. military combatant commanders are on alert Tuesday on his orders, though they are not facing any specific threats, Hagel told CNN's Jim Sciutto in an interview Tuesday.
"We want to be prepared. Just in case," Hagel said. "We want to be prepared and we are."
Several senators, defense officials and diplomats have raised concerns that the report's release could endanger U.S. personnel abroad. The report, the climax to a $50 million Senate Intelligence Committee investigation, will provide grisly details of Bush-era CIA "enhanced interrogation" tactics in the aftermath of the 9/11 terror attacks.