The founder of a volunteer group says it has found the remains of 13 more World War II Marines on a Pacific atoll.

Mark Noah, head of Marathon, Florida-based History Flight, tells The Associated Press that 12 sets of remains were found on Tarawa between January and March and a 13th set of remains was found this week.

The Pentagon’s Defense POW/MIA Accounting Agency confirms more remains have been found, although it couldn’t confirm the number. The agency says it will return the remains to the U.S. this summer.

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