FBI director: Investigators not yet certain who's responsible for cyberattack on Sony

FBI Director James Comey says investigators haven't yet determined who was responsible for a massive cyberattack on Sony Pictures Entertainment.

Comey told reporters Tuesday that "we're not at that point yet" to assign responsibility. The breach disrupted the movie studio's computer system and spewed online personal information about Sony employees.

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Comey said before investigators determine who is behind a breach, they like "to sort the evidence in a very careful way to arrive at a level of confidence."

Some have speculated that North Korea was behind the attacks in retaliation for the upcoming movie "The Interview." It's a comedy starring Seth Rogen and James Franco and which depicts an assassination attempt on that country's leader, Kim Jong Un (kim jawng oon).

North Korea recently released a statement denying responsibility, but also harshly condemning the movie.