Yosemite National Park in California is now closed until further notice.
Visitors are not permitted inside the park, and the closure will be enforced around the clock, according to the National Park Service.
Most national parks have announced facility closures, but this is the first full closure of a park.
The NPS attributes the closure to a request from the local health department.
Known for its towering granite cliffs, Yosemite is one of the country’s most treasured national parks. Established in 1890, it was the country’s third national park.