CLEVELAND, Tenn. (AP) -- A Bradley County grand jury has indicted the mother of two young boys who died of hyperthermia last month.

The sheriff's office said Wednesday night that 26-year-old Natasha Mach'e Moses Bates was charged with felony murder and other charges in the June 28 deaths of 3-year-old River Bates and 5-year-old Leland Bates.

The office said in a news release that the boys are believed to have died in a car. The temperature reached triple digits at the time.

Bates was being held without bond pending arraignment in criminal court.