The Japanese government has set up a special task force at the emergency management center of Prime Minister Taro Aso's office after Pyongyang reportedly conducted a nuclear test Monday.

Chief Cabinet Secretary Takeo Kawamura said that the DPRK's nuclear test is not to be tolerated.

And Japan will take decisive measures, the top government spokesman added.

At the prime minister's office, Vice Foreign Minister Mitoji Yabunaka said that Japan is to request the UN Security Council to convene an emergency meeting on Pyongyang's nuclear test, Vice Foreign Minister Mitoji Yabunaka said.

Earlier in the day, the Japan Meteorological Agency detected seismic waves from the Democratic People's Republic of Korea (DPRK), Kyodo News reported, citing a senior Foreign Ministry official.

The seismic waves were believed to be sent by the nuclear test, which has been confirmed by the DPRK's official news agency KCNA.

(Xinhua News Agency May 25, 2009)