Police said that the women believed that they were performing an "exorcism" on the children. The incident is still under investigation.
According to police, the Maryland Maryland Office of the Chief Medical Examiner ruled Saturday that Norell Harris, 1, and Zyana Harris, 2, died Friday from multiple stab wounds. The cause of their deaths was determined to be homicide.
Two other children—identified as 5-year-old Taniya Harris and 8-year-old Martello Harris—were found seriously and critically injured at the scene. They remain in the hospital as of Saturday evening being treated for injuries, police said.
Sanford was treated for minor injures related to the incident and Avery was not injured, according to police.
There have been no other charges in this case, and no further details have been released. The case is still under investigation. Anyone with information is asked to call the Major Crimes Division at 240-773-5070. Editor's note: This story was updated Sunday, Jan. 19, to include Sanford's booking photo.