All three victims' bodies were found in different shallow graves, in Kern's case behind an Akron mall with a gunshot wound to the head.

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"We do have some indications that there are some shallow graves that may have been found in the north, " Brooks said, when asked about the Kirkuk graves.

CNN: Mystery Kirkuk graves examined

KIRKUK, Iraq (CNN) -- Shallow graves found on the edge of a military base southwest of Kirkuk could provide answers to the whereabouts of Iraqis who disappeared under the regime of Saddam Hussein.

CNN: Mystery Kirkuk graves examined

They looked like shallow graves.

CNN: Digging in with the Marines