UPDATE: North Korea claims the test was of a hydrogen bomb. More at end of article.

Japan and South Korean officials are confirming North Korea conducted a nuclear bomb test Sunday afternoon local time. An earthquake measuring 6.3 on the Richter scale centered in the area of North Korea’s nuclear weapons facility was reportedly followed by a 4.6 quake that appears to be a cave-in due to the test. The test is reportedly the strongest of the previous five tests since 2006.

This is the first nuclear weapons test by North Korea in the Trump presidency. President Donald Trump has taken a much harder line with North Korea than his predecessors.

North Korea announced a special statement will be made at 1500 hours local time, 2:30 a.m. EDT.

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S. Korean authorities now confirming that this nuclear test was 9.8 times as powerful as last year's test, the previous biggest. https://t.co/pMtmExZLyY — Jonathan Cheng (@JChengWSJ) September 3, 2017

The south says a second quake measuring 4.6 magnitude was detected eight minutes later with China saying this was as a result of a “cave in’ — DanRiehl (@DanRiehl) September 3, 2017

#NorthKorea Nuclear Tests

October 9, 2006

May 25, 2009

February 12, 2013

January 06, 2016

September 09, 2016

September 03, 2017 — Zaid Benjamin (@zaidbenjamin) September 3, 2017

There are reports the nuke test was felt in Russia and China

OMG, KJU appears to have shaken Vladivostok. Many city residents, including myself, felt tremors at around 1:30 pm. https://t.co/2twpEuvjf7 — Artyom Lukin (@ArtyomLukin) September 3, 2017

https://twitter.com/mpspavor/status/904187414494683137

A major tunnel collapse could kick up some serious radiation into the atmosphere. Sniffers are certainly out in full force tonight. pic.twitter.com/yj66oPNkMO — ɪɴᴛᴇʟ ᴄʀᴀʙ (@IntelCrab) September 3, 2017

Strong onshore breezes may bring plumes of radioactive debris into neighboring #China and #Russia. pic.twitter.com/4vN0mjuLXs — ɪɴᴛᴇʟ ᴄʀᴀʙ (@IntelCrab) September 3, 2017

North Korea claims it can load hydrogen bomb onto missile https://t.co/zttua6ry5S pic.twitter.com/cdGyEWdceQ — CBS News (@CBSNews) September 3, 2017

North Korea has been engaging in provocative behavior in recent weeks, threatening Guam, launching a missile unannounced over northern Japan and yesterday claiming to have developed a hydrogen bomb capable of being placed on an ICBM.

UPDATE:

#DPRK broadcast says 6th nuclear test "a total success." pic.twitter.com/m2ItlIHL8E — Steve Herman (@W7VOA) September 3, 2017

Test of a hydrogen bomb intended to be mounted on an ICBM, claims #DPRK. https://t.co/BExcizoova — Steve Herman (@W7VOA) September 3, 2017

LIVE: North Korean TV announcer explaining Kim Jong Un's sign-off for sixth nuclear test earlier on pic.twitter.com/W5fEA5z8iA — Chad O'Carroll (@chadocl) September 3, 2017

Announcer Ri Chun Hee is talking about the bomb as being "two stage" pic.twitter.com/DqsYnWSkjy — Anna Fifield (@annafifield) September 3, 2017

The moment North Korea confirms successful test of a hydrogen bomb which can be placed on a IC ballistic missile pic.twitter.com/ajIzi1VPsw — Zora Suleman (@ZoraSuleman) September 3, 2017

“Announcer Ri Chun Hee is talking about the bomb as being “two stage””

Full statement from N. Korea on today's nuclear test. pic.twitter.com/mVciIpBgib — Jonathan Cheng (@JChengWSJ) September 3, 2017

Image of statement by North Korea.