North Korean authorities urged its citizens to stay indoors and avoid the yellow dust blowing in from China.
Officials in South Korea and the US say Pyongyang could use Saturday's parade marking the 75th anniversary of the founding of its Workers' Party of Korea to show off a new intercontinental ballistic missile.
The move came after North Korea's leader Kim Jong-un issued a rare personal apology for the killing.
South Korea has accused Pyongyang of fatally shooting one of its public servants, who was likely trying to defect, and burning his body after finding him on a floating object in North Korean waters earlier this week.
Seoul says the suspected defector was killed at sea and his body burned as a coronavirus precaution after he was interrogated in the water over several hours.
Leader Kim Jong-un to announce new five-year plan to develop country's dismal economy marred by US-led sanctions and coronavirus pandemic, state media report.
The report by an independent panel of experts monitoring UN sanctions said several countries, which it did not identify, believed North Korea's past six nuclear tests had likely helped it develop miniaturised nuclear devices.
Senior North Korean foreign ministry official Kwon Jong Gun ridiculed “nonsensical” calls by South Korea for revived negotiations between the US and North Korea, saying it has lost its relevance as a mediator.
The 49 individuals and organisations were sanctioned under a new regime targeting people who violate human rights.
Seventy years after the Korean War began, prospects for a peace treaty to officially end the conflict appear as distant as ever, as the two Koreas held low-key commemorations amid heightened tension on the peninsula.
North Korean leader Kim Jong-un presided over a video conference meeting of the ruling party's Central Military Commission, where members decided to suspend the military plans. Kim's sister warned last week of military action against the south.
Tensions between the two Koreas has risen in recent weeks after the North blew up a joint liaison office on its side of the border, declared an end to dialogue and threatened military action.
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