united states and all around the world. >> oous aide worker alan gross is back in the u.s. after spending the past five years in a cuban prison. he was jailed for allegedly trying to bring the internet to cuban dissidents. his release is part of a plan by the u.s. and cuba to slowly begin to normalize relations after 50 years of cold war tensions. >> the u.s. released three cubans, part of a group originally known as the cuban five. they were arrested in miami in 1998. convicted in 2001 for spying for cuba, an unnamed u.s. intelligence agent was also freed by havana. >> and the u.s. is now pointing the finger at north korea for hacking attacks on sony pick kmurps -- pictures. a group called guardians of peace is accused of leaking e-mails. most recently, the lacquers threatened anyone who goes to see sony's new movie "the interview" and that prompted sony to cancel the film's christmas day release.