YELLOWSTONE NATIONAL PARK, Wyo. (AP) — A wildfire has forced the evacuation and closure of a campground in northeast Yellowstone National Park.

The Slough Creek Campground is the smallest of the developed campgrounds in Yellowstone with 23 sites. But it is the first visitor facility in the park to be affected by wildfires burning in the park.

All other major tourist facilities and attractions are open. All park entrances are open.

Fire spokesman Bill Swartley says the fire that has closed the one campground burned actively overnight and firefighters were working past midnight to suppres spot fires being started ahead of the main fire.

The fire is one of five burning in Yellowstone. The largest fire has burned nearly 60 square miles and firefighters are working to keep it from spreading beyond the park's western boundary.