Unknown soldier's grave has plenty of company with 7 more sets of remains

US investigates burial of eight in grave of 'unknown' soldier
The US army said on Friday it had launched a criminal investigation after it found eight sets of cremated remains in the grave of an "unknown" soldier at Arlington National Cemetery.

Three sets of the cremated remains have so far been identified, and cemetery officials are in the process of notifying the families, she said.

Investigators are still looking into four other sets of remains, and the eighth was reinterred because it could not be positively identified.

Ms Horst said the investigation was ongoing, and that the army and the cemetery "take these matters seriously."

Chris Grey, of the army's Criminal Investigation Command, said the burial did not appear to have been an accident.

"When there's eight sets of human remains in one grave, it's most likely not a mistake, so we have to look into whether there is any criminality involved," he told USA Today.

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US investigates burial of eight in grave