A group claiming to be responsible for the massive computer hack at Sony Pictures Entertainment has demanded the company cancel the release of "The Interview," a film comedy that depicts an assassination plot against North Korea's leader.

A letter posted Monday on a file-sharing site asked Sony to "stop immediately showing the movie of terrorism which can break the regional peace and cause the War!" It was signed by GOP, the nickname for the "Guardians of Peace" group that says it is responsible for the cyberattack at Sony that began Nov. 24.

Pyongyang has denounced "The Interview" as "undisguised sponsoring of terrorism, as well as an act of war" in a letter to U.N. Secretary-General Ban Ki-moon.