PIERRE, S.D. -

Three South Dakota women accused of abusing two children on the Rosebud Indian Reservation are facing charges.

The office of U.S. Attorney Randolph Seiler says 41-year-old Verna Blue Thunder, 25-year-old Lorraina Lydia Stead and 21-year-old Lydia Lorena Stead, all of Mission, have pleaded not guilty to charges of child abuse and assault resulting in serious bodily injury.

Authorities say the women abused two children younger than 7 years old between October 2014 and June. Authorities say Blue Thunder also assaulted and seriously injured another minor between January and June. Court records do not provide details of the alleged incidents.

Blue Thunder's trial is scheduled for Nov. 1. No trial dates have been scheduled for the two other women.

The attorneys for the women did not immediately return calls seeking comment.