FBI points finger of blame at North Korea for Sony hack

The FBI has formally accused North Korea of launching a cyber attack against Sony Pictures.

The agency says there is now enough information to conclude that Pyongyang was behind the serious hack.

White House officials had previously stopped short of pointing the finger at North Korea.

The hack brought down Sony's computer network, prompting the leak of embarrassing emails, and led to the cancellation of the release of a new comedy film The Interview.

Barbara Plett Usher reports.