The exercises were meant to underscore "the seriousness with which we take DPRK's reckless behavior", White said, using an acronym for North Korea.
Separate geological agencies had detected two artificial tremors near North Korea's previous test site before the country touted its "perfect success" in a special announcement later that day.
North Korea's weakest nuclear test, its first one, conducted in 2006, generated a magnitude 4.3 quake. The USGS measured this month's nuclear test at magnitude 6.3.
While the cause remains unknown, alternative explanations suggested by North Korea analysts include tunnel collapses at the testing site. "Analysis ongoing", CTBTO Executive Secretary Lassina Zerbo said in a Twitter post, referring to Sept 3 test.
Russia's emergency ministry says background radiation in nearby Vladivostok was within the natural range.
In contrast, average retail prices in South Korea - which, like the North, has few hydrocarbons of its own - were only about half as much last week at 1,485 won per liter, or $1.31.
As we all continue to pay attention to Kim's nuclear missile posturing, it's important we not lose sight of North Korea's cyberattack initiatives, which have successfully disrupted the West in recent years and will continue to do so in the future if we don't take action.
REUTERSChina claims THAAD will do nothing to reduce tension with North Korea
Wang made the remarks at the General Debate of the 72nd session of the United Nations General Assembly at the UN headquarters in NY.
Trump called North Korean leader Kim Jong Un a "madman" on Friday, a day after Kim dubbed him a "mentally deranged U.S. dotard" who would face the "highest level of hard-line countermeasure in history" in retaliation for Trump saying the USA would "totally destroy" North Korea if it threatened the United States or its allies.
According to USA intelligence sources, the most recent test detonated a 140-kiloton nuclear device, which the North Koreans claim was a hydrogen bomb.
Others, however, have questioned whether a strong response from China - and China joining North Korea's adversaries - could lead to the conclusion desired by the United States and the UN: the denuclearization of North Korea.
In his Tuesday address at the United Nations General Assembly, President Donald Trump threatened to "totally destroy North Korea" if the U.S.is forced to defend itself or its allies.
President Trump has said the US will impose new sanctions on North Korea and praised China for taking measures to financial transactions with the nation.
There is significantly less traffic on the roads in Pyongyang than earlier this year, although AFP reporters in the capital have not seen any evidence to back up Trump's tweet that: "Long gas lines forming in North Korea". Western Intelligence services blamed the 2014 attack against Sony on North Korea's spy agency, the Reconnaissance General Bureau.
Tillerson spoke Thursday at a ministerial meeting of the U.N. Security Council called by the United States on "the acute threat" posed by the proliferation of nuclear, chemical and biological weapons.
Erdogan says Turkey to consider sanctions over Kurdish independence vote: Anadolu
The council urged "dialogue and compromise" to address differences between the Iraqi government and the regional authorities. A referendum of independence for the Kurdish region of northern Iraq is set for September 25.
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