A 12-year-old girl was in custody at a juvenile facility after she fatally stabbed her 9-year-old brother, police said.The stabbing was reported just before midnight Thursday at a residence in the St. Thomas Square community south of downtown Tulsa, Oklahoma, Tulsa police said in a statement Friday."Officers learned the children's parent was upstairs asleep when the 12-year-old daughter woke the parent up and said that she had stabbed her 9-year-old brother," police said.City firefighters and emergency medical technicians from a contract ambulance service administered CPR before the boy was rushed to a hospital, the department said.Children 12 and younger are prohibited from being held, but state law makes exceptions in cases of egregious, felony-equivalent allegations when children may be risks to the community or themselves."