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Police in Oklahoma say motive unclear in 5 fatal stabbings

This photo provided by the Broken Arrow, Okla., Police Department shows Robert Bever, a suspect in the stabbing deaths of an Oklahoma family in Broken Arrow, Thursday, July 23, 2015. Broken Arrow Police spokesman Cpl. Leon Calhoun said Thursday that Bever and another teenage son were apprehended and expected to be charged in the deaths of their parents, three siblings and an attack on a fourth sibling. (Broken Arrow Police Department via AP)

BROKEN ARROW, Okla. (AP) — Police in Oklahoma say they have turned to social media posts for clues about the motive of a teenager accused in the stabbing deaths of his parents and three siblings during a late-night attack that left bodies strewn through the family’s home.

A booking document filed by police in the Tulsa suburb of Broken Arrow accuses Robert Bever, 18, of five counts of first-degree murder and a count of aggravated assault in the attack Wednesday night.

Bever’s 16-year-old brother also was being held. Because he is a juvenile, officers have not released his name or announced charges against him. Broken Arrow Police Cpl. Leon Calhoun said both brothers were cooperating with the investigation.

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