Isle Royale National Park deaths: 2 found dead at remote island park in Michigan

KEWEENAW COUNTY, Mich. -- Two people were found dead at Isle Royale National Park in a "remote backcountry campground" within the park, according to the National Park Service.

The Isle Royal National Park is a remote island wilderness in the middle of Lake Superior in Michigan. It is only accessible by ferry, seaplane or private watercraft, according to the NPS.

Park rangers received reports of two people found dead at the campground on Sunday afternoon, the NPS said.

SEE ALSO: Abandoned boat and 11 bodies found on eastern Caribbean island with Mali passports

Rangers then hiked 11 miles overnight to reach the campground and assess the situation. They arrived early Monday morning and confirmed two unidentified people were found dead, the NPS said.

Their cause of death remains unknown, according to the NPS.

Additional ground and aviation resources responded on Monday, the NPS said.

The incident is currently under investigation.