The National Park Service banned drones from all 401 U.S. parks and memorials Friday.
Visitors to several parks, including Yosemite in California and Zion in southern Utah were already barred from using the unmanned remotely controlled aircraft. Jonathan Jarvis, the park service director, extended the ban to the entire system, 84 million acres, in an executive order to superintendents.
Parks can continue to use drones for research, and search and rescue. In his order, Jarvis said visitors might be able to use drones in some limited circumstances with advance approval.
Jarvis said in his order that there have been at least three incidents in the past year where unmanned aircraft have disturbed visitors or wildlife.