With about 25,000 visitors annually and no roads or electricity, Isle Royale's seclusion is both its appeal and what makes recent deaths there so mysterious.

Investigators are working to learn more after two unidentified campers were found dead at a remote backcountry campground at Isle Royale National Park, according to the National Park Service.Two rangers hiked overnight 11 miles to the campground after the park service received two separate reports about the deceased campers around 4 p.

The Federal Bureau of Investigation in Detroit confirmed June 11 that federal officials were at the Isle Royale National Park, following the death of two campers at the remote campground.