Concerns about abuses by Malian forces have mounted in recent weeks. Malian troops are fighting alongside French forces in a month-old operation to try to take back control of northern Mali from Islamist extremists who seized power last year.
Tieman Coulibaly told The Associated Press that four or five specific cases of "atrocities" by Malian troops are currently under formal investigation.
Asked whether Mali's weak military-led government is competent to carry out full and fair investigations of that kind, he said, "it's hard." He spoke Tuesday in Paris.
Witnesses and human rights groups say Malian troops are particularly targeting Arab and Tuareg populations.