In its announcement, North Korea said Tuesday's move was a response to South Korea's failure to stop activists from floating anti-Pyongyang leaflets across their borders
KNCA says all cross-border communication lines will be cut off on Tuesday noon
This is according to data being aggregated by the Johns Hopkins University's Center for Systems Science and Engineering (CSSE)
Kim quelled intense rumours about his health by attending a ceremony marking the completion of a fertiliser factory in his first public appearance in 20 days
KCNA said Kim cut a ribbon at the ceremony on Friday and those attending the event "burst into thunderous cheers of 'hurrah!' for the Supreme Leader..."
Pyongyang has never said who will lead the country if Kim was incapacitated. With no details known about his children, analysts say his sister, loyalists could form a regency till a successor is ready
Kim has not made a public appearance since presiding over a Workers' Party politburo meeting on April 11
Some unconfirmed media reports have speculated that Kim could be "in grave danger" after surgery
Kim has not appeared in public for over two weeks and was absent from a key event on Friday, amid rumours that he had heart trouble
Kim Jong-un has been out of public view since he was last seen on April 11 chairing a major party meeting, reports Yonhap News Agency
Seoul has also repeatedly indicated that there have been no unusual signs that could indicate health problems for Kim
An official familiar with US intelligence said that Kim was known to have health problems but they had no reason to conclude he was seriously ill
On Tuesday, Trump had wished Kim well after reports of his poor health surfaced
Speculation about Kim's health was raised after he missed the celebration of his late grandfather and state founder Kim Il Sung on April 15
"The test-firing was successfully carried out," Yonhap said on Monday, quoting the North Korean Rodong Sinmun newspaper
Earlier this month, Kim Jong Un sent a letter to South Korean President Moon Jae-in offering "comfort" as Seoul battled with worst coronavirus outbreak outside China at the time.
The Korean Central News Agency said Kim guided an artillery firing competition between army units on Thursday
South Korea said that launch appeared to be two short-range ballistic missiles
Britain, Germany, France, Estonia and Belgium raised North Korea's latest missile firings at the UN Security Council on Thursday
South Korea had said that North Korea fired what appeared to be two short-range ballistic missiles on Monday