U.S. Sen. Robert P. Casey Jr. wants the Department of Veterans Affairs to review all veterans' cemeteries in Pennsylvania after an audit found that some headstones were misplaced or missing at a cemetery in Philadelphia and five others around the country.

Casey (D., Pa.) sent a letter to the VA on Saturday, asking for the investigation. The department has already decided to review all 131 cemeteries under its control, VA spokesman Josh Taylor said this week.

An internal audit of the Philadelphia National Cemetery, at Limekiln Pike and Haines Street in West Oak Lane, found that 10 headstones were on the wrong plots and that three headstones were missing. There are nine VA cemeteries in Pennsylvania.

The VA audit also found problems at Beverly National Cemetery in Edgewater Park Township, Burlington County

The VA audit began after employees found that a contractor at a cemetery in Texas had shifted 47 markers one space away from the correct graves.

The review found problems with 123 graves in six states, including eight cases in which people were buried in the wrong site. The audit focused only on cemeteries that had undergone certain renovations.

"VA apologizes to the families affected by these errors," the department said in a statement. "We strive to operate the best cemetery system in the world, and we take immediate corrective actions any time we identify any issue."

The other mistakes consisted primarily of headstones and markers that were moved to the wrong graves during renovations, generally one space away from where they were supposed to be.

The department said it had contacted or would contact affected families to apologize and to describe the corrections being made.

The VA should be able to complete a review of the Pennsylvania cemeteries in several months, Casey said.

"That's a small price to pay to ensure that these families have peace of mind," he said.

Problems were also found at Dayton National Cemetery in Ohio, Santa Fe National Cemetery in New Mexico, and Loudon Park National Cemetery in Baltimore.

The problems don't appear to be near the scale of those discovered at Arlington National Cemetery, where an internal Army investigation found that at least 211 graves were unmarked or misidentified.

Details of the VA review were first reported in the Washington Post.