The National Park Service on Tuesday closed visitor centers at its Western Pennsylvania sites until further notice to promote social distancing as part of coronavirus-related precautions.

Restrooms and trails remain open to the public at all locations, including Friendship Hill National Historic Site.

The following features also are open:

• Allegheny Portage Railroad National Historic Site — Staple Bend Tunnel, picnic area;

• Flight 93 National Memorial — Tower of Voices, Flight Path, Memorial Plaza, Wall of Names;

• Fort Necessity Battlefield — Fort grounds and battlefield;

• Johnstown Flood National Memorial — North and South Abutment, picnic area.

National Park Service officials urged visitors to follow guidelines for preventing the spread of infectious diseases by: Maintaining a safe distance from others; frequently washing hands with soap and water for at least 20 seconds; refraining from touching one’s eyes, nose and mouth; covering coughs and sneezes. Those who feel sick are advised to stay home.

Health-related updates about Park Service operations will be posted at nps.gov/coronavirus.

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