The exact cause of the death of Seoul Mayor Park Won-sun remains under investigation.
The director-general of the Center for Disease Control and Prevention in China, where the virus was first reported, has previously warned not wearing masks is a "big mistake."
President Donald Trump wanted North Korean leader Kim Jong Un to know he "has a very friendly view" of him, South Korean President Moon Jae-in said.
"What's wrong with my nap?" asked the president, who is in Singapore this week to attend the Association of Southeast Asian Nations meeting.
The push for peace between the two countries is gathering steam.
President Moon Jae-in now has two Pungsan pooches to look after.
Moon is only the third South Korean leader to visit Pyongyang since the end of World War II.
"If both sides have the political willingness, it is reasonable for them to end the technical state of war on the peninsula first."
South Korea said the move "will contribute substantially to the alleviation of military tensions and the building of trust between the two Koreas."
With continued denuclearization negotiations on the way, the stakes for South Korea's Moon Jae-in are high.
"The Republic of Korea investment was over 90 percent of the cost," U.S. Commander Vincent Brooks said.
The defense secretary also defended the cancellation of joint military exercises, saying the move would create "increased opportunity for our diplomats to negotiate."
Urban freeclimber Alain Robert got to the 75th floor of the 123-storey building before surrendering.
Donald Trump confirms talks are still ongoing for potentially historic meeting with Kim Jong Un.
Will they, won't they? The meeting between U.S. President Donald Trump and North Korean leader Kim Jong Un is "moving along very nicely."
Kim Jong Un "has created sort of a cushion for failure, that if the U.S. backs away, the Chinese and Russians will be behind him," 38 North's Joel Wit said.
North Korea warned that "dialogue and saber rattling can never go together" as President Donald Trump receives South Korean President Moon Jae-in.
China revealed that it feels endangered. Washington can acknowledge China's importance by seeking its help to get Kim Jong Un to the negotiating table.
Nuclear weapons are not a force for good in the "right" hands. These are indiscriminate weapons of mass destruction, created to murder civilians.
North Korea is inviting foreign journalists to the event, scheduled for May 23-25.
The U.S. Forces Korea hold regular military drills with the South Korean army.
Kim Jong Un said it was painful to see the clocks in the summit room last week showing different times for the two countries.
North Korean television displayed patriotic images and mountains.
Kim's younger sister was the only woman at at the summit table and assisted her brother by handing him a pen, holding flowers and taking notes.
Could this be the beginning of a reunited Korea?
Kim Jong Un and Moon Jae-In looked triumphant as they shared a hug and signed the Panmunjom Declaration.