A 13-year-old girl who survived a stabbing attack that killed her parents and three of her siblings identified two brothers as the assailants, say police. Robert Bever, 18, and his unnamed 16-year-old brother are in custody, but authorities say they still have no idea what prompted the murder spree in Broken Arrow, Oklahoma, reports NBC News. They do know this, however: One of the boys who was killed—they're not sure whether it was the 12-year-old or the 7-year-old—managed to call 911 during the attack, and they say that call saved the 13-year-old sister and another 2-year-old sister who was found unharmed. The call may have saved others as well: Fox23 reports that a shipment of ammunition was on its way to the family home, for reasons that remain unclear.
"He did save the life of his 13-year-old sister and his 2-year-old sister and possibly many others after that," says Cpl. Leon Calhoun of the Broken Arrow police department. "He actually stated, 'Please help,’ and (said) their brother was attacking the family," says Calhoun. "Another male which we believe is one of the two suspects said hello and then hung up." When police arrived at the home, the suspects fled out the back door and were soon arrested. At the home, "officers could hear a faint voice from inside asking for help," according to a court affidavit, and found the 13-year-old, reports AP. Neighbors and co-workers haven't been able to shed much light: The Bevers largely kept to themselves, and the kids were home-schooled. (Read more stabbing attack stories.)