In this June 30, 2019, file photo, U.S. President Donald Trump, left, meets with North Korean leader Kim Jong-un, center, and South Korean President Moon Jae-in at the border village of Panmunjom in the Demilitarized Zone, South Korea. AP

North Korea kept up criticism of South Korea over anti-Pyongyang leaflets Tuesday, with its main newspaper casting Seoul's plan to crack down on such leafleting as a trick to escape the crisis and warning of a "lightning strike" against South Korean authorities.

The remarks came a day after President Moon Jae-in called on North Korea to leave the door open for inter-Korean dialogue, in a video message commemorating the first-ever summit between the leaders of the two Koreas.

Last Thursday, Cheong Wa Dae's national security office warned that the government would thoroughly crack down on the act of sending leaflets and related materials to the North and deal strictly with any violation in accordance with the law.

But on Tuesday, the Rodong Sinmun, the organ of the North's ruling party, dismissed Cheong Wa Dae's announcement, saying the strict measures the presidential office has come up with against the leaflet campaign is "merely a measure to escape from crisis."

"The world shall see how our people will give a lightning strike on South Korean authorities as punishment and exterminate these scums," said another report carried by the paper.