North Korean leader Kim Jong Un has overseen the testing of a "newly developed ultramodern tactical weapon", Pyongyang's state media reported Friday, in a move that will raise the temperature over denuclearisation talks.
It marked the first official report of a weapons test by North Korea since it began a delicate diplomatic process with Washington over its nuclear and missile programme.
"Kim Jong Un... visited the test ground of the Academy of Defence Science and supervised a newly developed ultramodern tactical weapon test," said the official Korean Central News Agency.
It said the test was successful but did not specify the type of device involved.
Pyongyang's suspension of testing for nuclear weapons and ballistic missiles has been key to this year's rapid diplomatic developments and North Korean-US negotiations, and has been repeatedly praised by President Donald Trump.
Trump and Kim met in a historic summit in Singapore in June, where they signed a vaguely worded document on denuclearisation of the peninsula.
Hours after the KCNA report, the US State Department said it was "confident" the process remained on track.
"At the Singapore Summit, President Trump and Chairman Kim made a number of commitments regarding final, fully verified denuclearisation and creating a brighter future for North Korea," a statement said.
"We are talking with the North Koreans about implementing all of those commitments. We remain confident that the promises made by President Trump and Chairman Kim will be fulfilled."
In response to the first reports, Adam Mount of the Federation of American Scientists tweeted: "That pit of dread you felt in your stomach when you read this is your reminder that the DPRK missile test pause is voluntary, partial, and can fail without notice if it isn't explicitly codified."
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