TULSA, Okla. (KFOR) – Authorities are continuing to investigate after a girl in Tulsa allegedly stabbed her younger brother last week.

Late Thursday night, Tulsa Police Department (TPD) was called to a reported stabbing in the southern portion of the city.

When officers arrived at the scene, paramedics and firefighters were already performing CPR on a 9-year-old boy, police explained in a press release.

The child was rushed to the hospital but later died from his injuries, TPD said.

According to investigators, the boy’s 12-year-old sister woke up their parents, who had been upstairs, and said that she had stabbed her 9-year-old brother.

The 12-year-old girl was taken into custody and is being held at the Family Center for Juvenile Justice. Police said the agency’s Child Crisis Unit is now handling the investigation.

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Police told WHNT’s Nexstar sister station KOTV that they are still working to determine why the girl stabbed her brother.

Neither child has been identified by police.