According to the BBC, North Korea has promised “merciless” retaliation if a forthcoming Hollywood movie about killing Kim Jong-un is released. A North Korean foreign ministry spokesman said in state media that the movie’s release would be an “act of war,” and that “If the US administration allows and defends the showing of the film, a merciless counter-measure will be taken.”

He did not mention the title, but a Hollywood movie called The Interview starring James Franco and Seth Rogen (and co-written by Rogen) is due in October. Franco and Rogen play a talk show host and his producer who are invited to interview Kim Jong-un, and are subsequently recruited by the US Central Intelligence Agency (CIA) to assassinate the leader. Rogen told Yahoo, “People have the hypothetical discussion about how journalists have access to the world’s most dangerous people, and they hypothetically would be in a good situation to assassinate them.”

North Korea is holding three Americans in custody. The latest to be detained is said to be a tourist named Jeffrey Edward Fowle, who reportedly left a Bible at a hotel.

Watch the teaser trailer below.