She did not specify why the talks had been canceled or if they had been rescheduled, only saying, "We will reconvene when our respective schedules permit".
North Korea's leader Kim Jong Un walks with President Donald Trump, left, during a break in talks at their historic US-North Korea summit at the Capella Hotel on Sentosa island in Singapore, June 12, 2018.
The State Department had earlier confirmed that Pompeo would meet Kim Yong Chol, a close aide of Kim, in NY to discuss progress toward a denuclearisation pact and to arrange a second summit following the historic talks between Trump and Kim in June.
Trump and Pompeo have consistently said that sanctions will not be removed until North Korea gives up its nuclear weapons and allows the worldwide community to verify it has done so.
The State Department is keen to kick off working level talks with the North Korean side, which Pompeo said the North had agreed to during their last meeting. North Korea's propaganda services have not mentioned the meeting.
The cancellation comes amid North Korean threats to restart its nuclear development unless the USA begins to remove sanctions - a step the administration says it will not take until North Korea meaningfully moves to denuclearize, which it so far has not done.
Pompeo, speaking on Sunday on Fox News, said he was "not worried" about the North Korean demands and insisted there would be "no economic relief until we have achieved our ultimate objective".
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That decision came after Kim Yong-chol met with Pompeo in NY in May. "We're in no hurry", Trump told reporters at a White House press conference.
"I expect us to make real progress, for example, that the summit between our two leaders can be held", he added.
North Korea's foreign ministry has warned that Pyongyang will "seriously" consider reviving its nuclear weapons program unless USA sanctions are lifted.
Pompeo was supposed to travel to NY on Thursday to meet with his North Korean counterpart, Kim Yong Chol. -North Korea dialogue, sought to play down the talks delay.
"The fear from America's perspective would be that the South Koreans might go too fast and agree to things that would involve, for example, our troops, our economic postures that we wouldn't be prepared to give [at this stage], without perhaps getting significant concessions on reductions of weapons testing", retired U.S. Ambassador Kristie Kenney said Wednesday.
South Korea's presidential office said the government would later announce its stance over the postponed meeting, but South Korean news agency Yonhap said South Korean officials were notified by the US of the postponement before it was announced in Washington.