Motive still unclear in Dallas teen's drive-by shooting death

Newly-released court documents reveal more details about the drive-by shooting that killed a Dallas 14-year-old girl but fail to identify a possible motive.

Two brothers were arrested last week for the murder of 14-year-old Natalie Hernandez on February 12. The teen was in a car with three other friends at a city park across the street from Hawthorne Elementary School in Pleasant Grove when she was shot. Her 16-year-old friend was also injured, but he survived.

The two probable cause affidavits for murder warrants identify 22-year-old George Salazar and his 25-year-old brother, Ernest Salazar. Investigators found "several fired casings from a high powered rifle" at the scene, according to the affidavits.

Court documents say a witness, who's been deemed confidential, provided specific information "that only a witness or a suspect would know."

Court papers say that confidential witness told investigators "Ernest Salazar admitted to the witness that he was the driver of the vehicle and his brother George shot at the vehicle" carrying Natalie and three others.

Court documents also say "the witness saw suspect George Salazar with a high-powered rifle several minutes after the shooting." Detectives say that information is consistent with evidence recovered at the scene.

The affidavit also says "the accounts of the witness were supported by the accounts of the surviving witness in the vehicle during the shooting."

While the court documents may provide insight as to what happened, they fall short of answering the biggest question: why?

According to the documents, the identity of the key witness will remain confidential for their safety and for the integrity of the investigation.

Both George and Ernest are charged with murder. They’re being held at the Lew Sterrett Jail on $500,000 bonds.