Oklahoma authorities are still trying to determine a motive for a quintuple murder near Tulsa this week -- in which police say two teen brothers killed their parents and three siblings. The stabbings happened on Wednesday night at the Bever family home in the town of Broken Arrow, a suburb of Tulsa. According to investigators, Robert Bever, 18 and a 16-year-old brother used "blade-type" weapons to kill all five. The brothers' father and mother and three siblings -- two boys, ages 12 and 7, and a 5-year-old girl -- all died at the home. A fourth sibling was also wounded in the attack, but she survived. A newly released police report said the 13-year-old survivor was the one who pointed the finger at her brothers. A fifth sibling, a 2-year-old girl, was in the home during the attacks but was not hurt.
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