BEIJING—A U.S. citizen diagnosed with the coronavirus has died in Wuhan, the Chinese city at the center of the outbreak, marking the first known American death from the disease.

The person was 60 years old and died Thursday at Wuhan’s Jinyintan Hospital, a spokesman for the U.S. Embassy in Beijing said Saturday. He provided no further details. “We offer our sincerest condolences to the family on their loss,” he said. “Out of the respect for the family’s privacy, we have no further comment.”

A spokesperson at Jinyintan Hospital referred questions to the Wuhan foreign affairs office, which didn’t answer phone calls.

Chinese authorities said fatalities in China from the coronavirus reached a single-day high of 86 on Friday. They said they confirmed 3,399 new cases of infections from the virus that causes respiratory illnesses, bringing the total to 34,546.

Globally, there have been 34,886 confirmed cases and 724 deaths, the World Health Organization said on Saturday, with over 99% of the cases and all but one death in China.