Bones found by two boaters on Sunday under the Arthur Ravenel Jr. Bridge have been ruled human by the Charleston County Coroner’s Office.

A forensic anthropologist will examine the jawbone this week, which could include DNA testing, officials said. A Georgetown man and a friend from Hartsville were boating in the Cooper River when they stopped to look for old bottles on Drum Island, which is under the Charleston side of the bridge on Sunday. During their hunt, they came across what appeared to be the lower half of a human jaw, according to a police incident report.

The men returned to shore with the bone in their boat, and they called the Mount Pleasant Police Department about 7:30 p.m. Sunday.

Uninhabited by people, Drum Island has served as a disposal site for dirt dredged from the depths of Charleston Harbor. It’s also a popular roosting ground for birds and breeding area for mosquitoes.

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