A sailor aboard the Los Angeles-class nuclear-powered submarine USS San Francisco died Sunday from injuries sustained when the sub ran aground Friday about 350 miles south of Guam.

The name of the sailor is being withheld pending a mandatory 24-hour waiting period, which began when next of kin were notified, according to Pacific Fleet spokesman Jon Yoshishige.

Navy medical personnel came aboard the submarine at the first opportunity Sunday morning, Yoshishige said, “but the one sailor’s injuries were extremely serious.

“The medical personnel, including a doctor, remain aboard and are treating 23 other crew members for a range of injuries including broken bones, lacerations, bruises and a back injury.”

The cause of the accident is under investigation, Yoshishige said, adding that “further information will be released when available.”

There were no reports of damage to the San Francisco’s reactor plant, which was operating normally, officials said.

The 360-foot submarine, with its crew of 137 sailors, remains surfaced as it continues toward its permanent base in Guam. The U.S. Coast Guard Cutter Galveston Island and USNS Stockham are escorting the San Francisco.

The submarine is expected to arrive in port Monday afternoon, the Pacific Fleet spokesman said, adding that the USNS Kiska and military aircraft also are continuing to assist as required.

“Our sincerest condolences and prayers go out to the family and friends of the sailor,” Yoshishige said.

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