PETERSBURG, Va. (AP) — The National Park Service says the Petersburg National Battlefield has apparently been looted.

Jeffrey Olson, agency spokesman, said in a news release Friday that numerous excavations were found at the Civil War battlefield last week. Olson said by phone that because of the ongoing investigation, he could not say how many excavations were found or whether the excavations were done by hand or machine.

He says thieves were probably looking for relics.

The incident is under investigation.

Petersburg National Battlefield is a 2,700-acre park where more than 1,000 Union and Confederate soldiers died fighting during the Siege of Petersburg 151 years ago.