North Korean leader Kim Jong Un placed the city of Kaesong under lockdown after a person suspected to have the coronavirus returned from South Korea. Kim declared a state of emergency and called it a “critical situation in which the vicious virus could be said to have entered the country,” North Korea’s state news agency KCNA reported.

Kaesong is near the border with South Korea and is about 100 miles south of the North Korean capital Pyongyang. The state news agency reported an individual who defected to South Korea three years ago came back across the militarized border that separates the two Koreas with symptoms that suggested Covid-19.

People watch TV showing North Korean leader Kim Jong Un during a news program at Seoul Railway Station in Seoul, South Korea, on June 24, 2020 (Photo: Ahn Young-joon/AP)

After running several tests, health officials put the person and any contacts under quarantine, as well as those who have been in Kaesong in the last five days, state media reported. If the case is confirmed to be coronavirus, it would be the first official case acknowledged by North Korean officials.

The country has yet to report a confirmed case of COVID-19, a claim doubted by outside experts.  In the early days of the coronavirus crisis, Pyongyang says it mobilized quickly to fight for its “national survival.”

NPR’s Anthony Kuhn reported in February that North Korea closed its border and cut transport links with neighboring China, extended its quarantine period from 15 to 30 days, and restricted the activities of foreign diplomatic and international organization staff in Pyongyang.

Reports suggest that closing the border with China, North Korea’s main trading partner, has caused economic activity to slump and prices to soar.