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Live Reporting

By Alastair Lawson and Vicky Baker

All times stated are UK

  1. Live coverage on hold

    We're pausing our live page coverage for now. You can continue to follow the main developments in our story here. The key points so far are as follows:

    • North Korea has tested what it says is a hydrogen bomb that could be loaded on to a long-range missile
    • US President Donald Trump said North Korea's "words and actions" were "very hostile and dangerous"
    • South Korea, Japan, China and Russia have all voiced strong criticism of the North's sixth nuclear test
    • UK Prime Minister Theresa May said the "reckless" test was an "unacceptable further threat to the international community"
    Kim Jong-un and a suspected hydrogen bomb
  2. US senator: 'Thousands could be killed or maimed'

    US Republican Senator Lindsey Graham told BBC HARDtalk on Saturday that an American first military strike against North Korea is "inevitable" if something does not change.

    Mr Graham was speaking to programme host Stephen Sackur at the Ambrosetti Forum in Italy, just hours before North Korea's new claim of a successful hydrogen bomb test.

    "I am 100% certain that if Kim Jong-un continues to develop missile technology that can hit America, if diplomacy fails to stop him, there will be an attack by the US against his weapon system. I'm assuming the worst, I'm assuming we drop one bomb, he fires at South Korea and maybe Japan. Let me tell you how the war ends: it ends with his utter destruction. Thousands of people could be killed or maimed.

    "There's a lot at stake here. Let me ask you: why would the world allow him [Kim Jong-un] to get a hydrogen bomb with a missile to deliver it anywhere in the world? Why would we do that?"

  3. Japan 'may target North Korea's oil'

    Japan will work with the US and others to implement existing stringent UN Security Council sanctions resolutions on North Korea, in addition to pursuing the adoption of a new, stricter resolution, says Chief Cabinet Secretary Yoshihide Suga, according to Kyodo News.

    Mr Suga - the government's top spokesman - said that imposing restrictions on North Korea's trade in crude oil and oil products is "one of the options" Japan might seek.

    But he said it would require the agreement of China and Russia, the permanent members of the Security Council with economic ties to Pyongyang.

  4. Sanctions 'do not appear to be working'

    Lassina Zerbo, head of the Comprehensive Nuclear-Test-Ban Treaty Organisation
    Image caption: The executive secretary of the Comprehensive Nuclear Test Ban Treaty Organisation, Lassina Zerbo (above), says that it is up to the international community to decide its response to the latest North Korean test, but that the current range of sanctions did not appear to be working: "The [UN] Security Council has dealt with many sanctions and the sanctions seem to not be stopping [North Korea] from going beyond the acceptable in terms of their nuclear weapons programme. "'Where do we go?' is probably the million-dollar question, but I think many of the states today in their remarks have urged a political and diplomatic solution to this problem."
  5. China and Russia stick together - Xinhua

    Chinese President Xi Jinping and his Russian counterpart Vladimir Putin have agreed to stick to their goal of the denuclearisation of the Korean peninsula, according to Chinese news agency Xinhua.

    They agreed "to keep close communication and co-ordination to deal with the new situation" and "appropriately deal with" the latest nuclear test, the agency said.

    China and Russia have already voiced strong criticism against the latest nuclear test.

  6. Mishandling crisis 'could lead to nuclear proliferation'

    US-based security expert Vikram Singh tweets:

  7. BreakingA 'serious and grave threat' - May

    Prime Minister Theresa May has spoken about North Korea's test, describing it as "reckless and posing "an unacceptable further threat to the international community".

    She added: "I discussed the serious and grave threat these dangerous and illegal actions present with President Abe in Japan this week and reiterate the call we jointly made for tougher action, including increasing the pace of implementation of existing sanctions and looking urgently in the UN Security Council at new measures.

    "This is now even more pressing. The international community has universally condemned this test and must come together to continue to increase the pressure on North Korea's leaders to stop their destabilising actions."

    Theresa May
  8. Pyongyang's pride at bomb test

    North Koreans gathered in front of a large screen outside Pyongyang Station and applauded as state television broadcast a special announcement confirming the hydrogen bomb test.

    Speaking on North Korean TV, Shin Seok Chol said: "I feel great pride in how much our nuclear warheads have advanced in their precision. We can now perfectly rely on our operational ability, and it is astonishing how greatly our nuclear weapons technology has progressed."

    Another man, Jang Guk Hwan, said he was "cheering with pride and honour to call myself part of the people of our great and respected leader, Kim Jong-un's nation".

    People watching a large public TV screen
  9. US treasury secretary: 'We will work with our allies'

    "I'm going to draft a sanctions package and send it to the president for his strong consideration so anybody (who) wants to do trade or business with them will be prevented from doing trade or business with us," Treasury Secretary Mnuchin tells Fox News.

    "We will work with our allies. We will work with China. But people need to cut off North Korea economically, this is unacceptable behaviour."

  10. US 'to draft new sanctions package'

    US Treasury Secretary Steven Mnuchin is reported to be drafting a new sanctions package on North Korea to give to President Trump. He tells Fox News that will ask the president to "strongly to consider" cutting off all trade and impose new sanctions.

  11. Trump team 'to discuss crisis later on Sunday'

    President Trump and his national security team will have a meeting later on Sunday to discuss North Korea's latest nuclear test, a White House statement says.

  12. Border life appears normal

    :A pedestrian in Tokyo watches a monitor showing an image of North Korean leader Kim Jong-Un
    Image caption: As news of the latest nuclear test reverberated around the world, life on the border between North and South Korea continued as normal.
    South Korean tanks take part in a military exercise in Paju, South Korea.
    Image caption: South Korean tanks continued their military exercises in Paju, close to the border with the north.
    A South Korean boy uses binoculars to look over the North Korea at the Imjingak observation post in Paju
    Image caption: Elsewhere in Paju, people continued to look at North Korean positions from viewpoints.
    A North Korean guard post seen from a South Korean observation post in Paju
    Image caption: There was no unusual activity to be seen at North Korean guard posts viewed from Paju.
  13. The 21st Century's 'only nuclear test'

    North Korea is the only country that has performed a nuclear test in the 21st Century, The Washington Post says. The paper points out that most nuclear powers - including the US and Russia which between them possess 93% of global nuclear warheads - have not performed a nuclear test in decades.

  14. A history of exploded nuclear weapons

    The apparent hydrogen bomb that North Korea is believed to have detonated underground on Sunday has been estimated at 100 kilotons.

    This is five times more powerful than Fat Boy, the bomb dropped on Nagasaki by the US in 1945 and which killed 70,000 people instantly.

    But how does it compare with the other big bombs exploded on Earth?

    Atomic bomb explosion over Nagasaki
  15. Bomb 'could end an American city'

    Regardless of whether it was actually a hydrogen bomb, the explosion was big enough to “pretty much end an American city” if strapped on an ICBM, Vipin Narang, an associate professor of political science at the Massachusetts Institute of Technology tells Bloomberg.

  16. Stop 'nasty threats' towards N Korea

    Abdul Qadeer Khan, the Pakistani scientist accused of selling nuclear secrets to North Korea, Iran and Libya, has said he is “not surprised” with Pyongyang’s sixth nuclear test, Japanese news agency Kyodo reports.

    Mr Khan, who is described as the architect of Pakistan's nuclear weapons programme, has urged Western countries, as well as Japan and South Korea, to stop their "nasty threats and rhetoric" towards Pyongyang.

  17. Trump stance questioned

    Trump on Air Force One

    President Trump's tweet attacking South Korea's "talk of appeasing" North Korea is coming in for some criticism.

    Some observers say his stance may be related to a threat to pull the US out of a trade deal with South Korea.

    On Saturday reports said Mr Trump had asked aides to prepare for US withdrawal. In July the US told South Korea it wanted to renegotiate a 2012 trade deal, citing a lopsided trading relationship.

    In July South Korea proposed holding military talks with the North, after weeks of heightened tension following a long-range missile test by Pyongyang.

    Joshua Pollack, associate fellow at defence and security think tank RUSI, said the two were linked.

    View more on twitter

    Meanwhile, others say the US should be showing support for its ally rather than criticising and "threatening a trade war".

    View more on twitter

    And some people - including BBC North America Editor Jon Sopel - are asking how Mr Trump proposes to tackle North Korea.

    President Trump has already threatened North Korea with "fire and fury like the world has never seen" - but North Korea has responded by carrying out its biggest-ever nuclear test.

    View more on twitter
  18. Johnson condemns 'reckless' test

    Meanwhile British Foreign Secretary Boris Johnson has condemned North Korea's "reckless" nuclear weapon test and said "all options are on the table".

    However he also said there was no easy military solution, as none of the options were good.

    View more on twitter