Hours after an artificial earthquake was detected near North Korea’s nuclear test site Friday morning, North Korea announced it was successful in conducting an explosion test of its nuclear warheads. It was North Korea’s fifth nuclear test overall, and first since January. The United States Geological Survey reported a 5.3 magnitude quake occurred around 9:30 a.m. local time, not far from Punggye-ri, the site of previous nuclear tests. South Korean President Park Geun-hye released a statement saying the test shows the “fanatic recklessness of the Kim Jong Un government as it clings to a nuclear development,” and China’s Foreign Ministry declared that Pyongyang carried out the test with “disregard” for international objections. North Korea is celebrating the 68th anniversary of the start of the communist regime by Kim Il Sung.