BROKEN ARROW, Okla. (AP) - Oklahoma police on Friday scoured the social media posts and interests of a teenager accused in the stabbing death of five family members for clues to explain a late night attack that left bodies strewn through a two-story house in a quiet neighborhood.
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.
Calhoun said the agency was still looking for a motive and was searching social media accounts they believe to belong to Bever. Those include community site Pinterest and a Facebook account.
On Pinterest, he showed an interest in Star Wars, the heavy metal group Linkin Park and sports cars. A Facebook post lists him as a recent graduate of Citizens' High School, which describes itself as providing "a home-school curriculum" for people hoping to earn a college degree.
The dead include his parents, David Bever, 52; April Bever, 44; plus three siblings - boys ages 12 and 7 and a sister aged 5. A 13-year-old sister was in serious but stable condition in a hospital, and a 2-year-old sister wasn't harmed and was placed in state custody.
Documents filed to support the teenager's arrest said a caller from the home was able to tell police "their brother was attacking their family." Police had said Thursday that the 911 call was silent. Calhoun said the agency would release audio on Monday.
After officers arrived at the home, "officers could hear a faint voice from inside asking for help" and found the 13-year-old bleeding from multiple stab wounds, the affidavit said.
The young girl was still alive and made statements to the officers that "her brothers" were responsible for the attack, it said.
Fresh footprints in the backyard led officers to a wooded area, where they found the brothers.
A neighbor of the family, Matt Jacobsen, on Friday described the 16-year-old as a follower, not a leader, and "nerdy," given his interest in computers and technology. Others in the subdivision noted the family seemed isolated to the point that they appeared to avoid community events.
David Bever's sister, Tamela Massey of Seminole, Florida, said her family is dealing with grief following the death of her brother and members of his family, and that they do not know what may have triggered the tragedy.
"We have no idea," she said.