HOUGHTON, Mich. — Rangers hiked 11 miles (17.7 kilometers) overnight to confirm the deaths of two people who were camping at an island national park in Michigan's Lake Superior, authorities said Tuesday.

“The causes of death are unknown at this time. ... The incident is currently under investigation,” Isle Royale National Park said in a statement.

Two rangers set out Sunday night after park staff was informed that two people were dead at a remote campground. They reached the site Monday.

A phone message left with park authorities seeking more information Tuesday was not immediately returned.

Isle Royale is an extraordinary wilderness park, accessible only by ferry, personal boat or seaplane and only open six months a year due to extreme weather.

The island's population of moose and wolves is regularly studied by wildlife scientists.

Gregg Sarra sounds off on Farmingdale vs. Massapequa and the battle between Longwood and Floyd, plus Michael Sicoli recaps some of the playoff soccer games, an update on the high school fantasy football standings and the plays of the week. Credit: Newsday

Sarra Sounds Off, Season 3, Ep. 6: Top football teams in action and soccer playoffs roundup Gregg Sarra sounds off on Farmingdale vs. Massapequa and the battle between Longwood and Floyd, plus Michael Sicoli recaps some of the playoff soccer games, an update on the high school fantasy football standings and the plays of the week.

Gregg Sarra sounds off on Farmingdale vs. Massapequa and the battle between Longwood and Floyd, plus Michael Sicoli recaps some of the playoff soccer games, an update on the high school fantasy football standings and the plays of the week. Credit: Newsday

Sarra Sounds Off, Season 3, Ep. 6: Top football teams in action and soccer playoffs roundup Gregg Sarra sounds off on Farmingdale vs. Massapequa and the battle between Longwood and Floyd, plus Michael Sicoli recaps some of the playoff soccer games, an update on the high school fantasy football standings and the plays of the week.

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