North Korea orders joint probe into Sony hacking

North Korea is proposing a joint investigation with the U.S. to look into the massive cyberattack against Sony Pictures Entertainment.

On Saturday, a spokesman for North Korea's Foreign Ministry in Pyongyang promised "grave consequences" if the U.S. does not agree to a joint investigation.

"The U.S. should bear in mind that it will face serious consequences in case it rejects our proposal for joint investigation and presses for what it called countermeasures while finding fault" with North Korea, the spo