Kaesong

Kim Jong-un declared a state of emergency and imposed a lockdown on the border city of Kaesong after a person suspected of being infected with the novel coronavirus returned from South Korea after illegally crossing the border.
According to KCNA, a person "who went to the south three years ago, a person who is suspected to have been infected with the vicious virus, returned on July 19 after illegally crossing the demarcation line.".
If confirmed, it would be the first case officially acknowledged by Pyongyang.
North Korea has blown up an inter-Korean liaison office at its border hours after threatening South Korea with military actions. The joint liaison office, located near the North Korean border town Kaesong, was opened in 2018 and was used for talks with South Korea. The explosion was confirmed by South Korea's Unification Ministry at 2:49 p.m. local time. Kim Yo-jong, sister to Kim Jong Un, had threatened the demolition of the office last weekend.