A person with a confirmed case of coronavirus has been in "multiple" county buildings in downtown Seattle.

King County has not announced the case publicly, but it informed employees Thursday morning.

Spokesperson Chase Gallagher declined to say what buildings were involved. He says the number of coronavirus cases will keep rising.

"As this progresses and more testing and positive identification is occurring, the detail level that gets transmitted may be decreasing as the numbers increase,” Gallagher said.

A source at the county tells KUOW that the King Street Center was where the person works.