WASHINGTON — Three people were buried in the wrong graves at Arlington National Cemetery, the Army said Wednesday as it followed up an investigation into bookkeeping problems and burial mix-ups at one of the nation's most hallowed sites.

After a report issued in June found that the problems could potentially affect thousands of graves, defense officials received about 1,100 calls from worried families.

One of those callers, the widow of an Army staff sergeant, led to the exhumation of three graves late last month. The three remains in those graves, all former members of the armed forces, were found to be in the wrong place, said Gary Tallman, an Army spokesman.

"The families are satisfied that the problem was fixed," Tallman said Wednesday.