The FBI says it may not be able to identify all of the remains found in a mass grave at a Chicago cemetery.

Last week, four workers at the Burr Oak Cemetery were charged with digging up hundreds of graves and reselling the plots.

The cemetery is closed while forensics experts help with the investigation.

Meanwhile, family members are waiting to see if their loved ones' gravesites are still intact.

"My mother never saw her grandchildren, so I brought them here," one resident said.  "Now I have nowhere to bring my children."

"You thought when you buried them they would be in peace," another said.  "There's no peace now."

Burr Oaks is an historic black cemetery and the final resting place of civil rights icon Emmitt Till.

His glass topped casket was found rusting in a shed.  Till's body had been exhumed years ago.  Investigators say his new burial site was untouched.