North Korea has compared President Barack Obama to a monkey and blamed the U.S. for shutting down its Internet amid the hacking row over the movie “The Interview.”

North Korea on Saturday proposed a joint investigation with the U.S. into the hacking attack against Sony Pictures Entertainment, warning of “serious” consequences if Washington rejects a probe that it believes would prove Pyongyang had nothing to do with the cyberattack.

Video secretly taken in North Korea shows public executions by firing squad. The country is said to begin a currency revaluation that turns disastrous. Leader Kim Jong Un is reported to have thrown South Korean leaflets containing rumors about his wife in his aides’ faces.

North Korean and South Korean troops exchanged fire Sunday along their heavily fortified border in the second such shooting in less than 10 days, South Korean officials said.