Japan and the United States sent on Wednesday (6) reconnaissance aircraft to a nearby region of the Korean peninsula to measure radioactivity in the air, after North Korea announced it had conducted its first test of a thermonuclear bomb.
An aircraft of the Japan Self-Defense Forces will collect air samples to analyze the presence of radioactive particles, which could be an indication of the new atomic test Kim Jong-un regime, informed government sources to the Japanese news agency "Kyodo".
The United States also sent planes to the region for the same purpose, and proceeded in previous nuclear test Pyongyang in 2006, 2009 and 2013, said a spokesperson of the Japanese Ministry of Defense.
If radioactive materials are found in the air, they can provide information on the nature of the nuclear test reportedly carried out by Pyongyang.
However, the last North Korean atomic experiment, in 2013, the reconnaissance aircraft found no traces of radiation, which could indicate that North Korea completely sealed the tunnels where the detonation occurred.
North Korea announced on Wednesday in a state television station which conducted its first nuclear test with a hydrogen bomb, shortly after an earthquake measuring 5 on the Richter scale was detected in the northeast as a result of atomic detonation.
Before the announcement, seismological centers in South Korea, USA, China and Japan had detected an earthquake with a magnitude between 4.2 and 5.1 in the northeast, near the base of nuclear testing Punggye-ri, where the experiments took place above.
If confirmed, today would be the first detonation of a thermonuclear weapon with Pyongyang, whose detonation is much more powerful than conventional atomic devices used by North Korea in their earlier experiments.
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