Two unidentified campers were found dead Sunday on Isle Royale National Park.

Park rangers received two reports at approximately 4 p.m. Sunday of two people dead at a backcountry campground on the Lake Superior island about 15 miles east of Grand Portage, Minn., the Michigan park said in a news release Tuesday morning.

Two rangers hiked 11 miles overnight, arriving Monday morning at the campground, where they confirmed the two people were dead.

The causes of death were unknown, the news release said.

Additional ground and aviation resources responded Monday. The deaths are under investigation.

Isle Royale National Park consists of Isle Royale and approximately 400 adjacent islands. It is accessible by ferry, floatplane and boat.

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