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. 
 
 This Friday, July 24, 2015 booking photo provided by the Tulsa County Sheriff's Office shows Robert Bever. A booking document filed by police in the Tulsa suburb of Broken Arrow, Okla., accuses Bever,... (Associated Press) 
 
 Crime scene tape marks off the area as police investigate scene, Thursday morning, July 23, 2015, in Broken Arrow, Okla., where authorities say five people were found dead late Wednesday night. Police... (Associated Press) 
 
 A worker wheels a gurney with a body bag on it, under the green cover, to a coroner's van outside of a home in Broken Arrow, Okla., Thursday, July 23, 2015, where five family members were discovered stabbed... (Associated Press) 
 
 Corporal Leon Calhoun, with the Broken Arrow police department, talks with the media outside of a home, at right at rear, in Broken Arrow, Okla., Thursday, July 23, 2015, where five family members were... (Associated Press) 
 
 A worker does paperwork near a gurney with a body bag on it in the door of a coroner's van outside of a home in Broken Arrow, Okla., Thursday, July 23, 2015, where five family members were discovered... (Associated Press) 
 
 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... (Associated Press) 
 
 An investigator walks past a tarp covering a body in the front yard of a house in Broken Arrow, Okla., Thursday, July 23, 2015, where five family members were discovered stabbed to death. Police were... (Associated Press) 
 
 Cindy Rigney, left, and Glenna Parkman, right, who live in Broken Arrow, arrive with a wreath outside of a home in Broken Arrow, Okla., Thursday, July 23, 2015, where five family members were discovered... (Associated Press) 
 
 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 Friday that the agency was still looking for a motive and was searching social media accounts that they believe belong to Bever. Those include community site Pinterest and a Facebook account. 
 
 On Pinterest, Bever showed an interest in Star Wars, the rock 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, and April Bever, 44. The Oklahoma State Medical Examiner's Office on Friday also identified the three dead siblings as Daniel Bever, 12; Christopher Bever, 7; and Victoria Bever, 5. An unidentified 13-year-old sister was in serious but stable condition in a hospital and an unnamed 2-year-old sister wasn't harmed and was placed in state custody. 
 
 By many neighbors' accounts, the Bevers kept out of sight and to themselves — the kids played alone in the backyard, walked down neighborhood streets bunched together and their parents didn't socialize much. That appeared to carry over to the father's work. 
 
 David Bever's former co-workers in the IT department at Samson Resources described him as a quiet man who kept to himself. 
 
 "He was a nice guy, but we weren't close," said Lisa Wolfe, Bever's supervisor at Samson. "I hired him. He worked for us for several years as a contractor. He was a good worker and a nice guy. He didn't get involved in any office politics, and those are the kind of people I like to work with. 
 
 "He liked to do his work and focus on that. He didn't socialize a lot with the folks he worked with," Wolfe said. 
 
 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. 
 
 ___ 
 
 Associated Press writer Sean Murphy contributed to this report from Oklahoma City. ||||| An Oklahoma girl found injured after her parents and three siblings were stabbed to death Wednesday night told police that her teenage brothers were the killers, according to police records. 
 
 Robert Bever, 18, and his 16-year-old brother are in police custody after their parents, David and April Bever, and the teens' three siblings, who were between 5 and 12 years old, were found slain in their Broken Arrow home. 
 
 A 13-year-old girl who was stabbed several times but was found alive "made statements to officers that her brothers was [sic] responsible for attacking her and her family," Broken Arrow Police said in an arrest report released Friday. 
 
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 "We believe both of them to have been involved in the homicide," Broken Arrow Police Cpl. Leon Calhoun said. 
 
 Robert Bever is being held on five counts of first-degree murder and a count of aggravated battery with a deadly weapon, according to booking papers. The name of the 16-year-old has not been released. Police will seek to have the 16-year-old tried as an adult, Calhoun said. 
 
 Officers went to the home at around 11:30 p.m. Wednesday after someone called 911 and said the family was being attacked before the call went silent, police said. Arriving officers heard a faint voice crying for help and found the 13-year-old on the floor and discovered the bodies, police said. 
 
 The 911 caller is believed to be one of the children who were killed, either a 7-year-old boy or a 12-year-old boy. 
 
 The Oklahoma State Medical Examiner's Office on Friday identified the three dead siblings as Daniel Bever, 12; Christopher Bever, 7, and Victoria Bever, 5, according to The Associated Press. 
 
 The injured girl is in stable condition at a local hospital, police said. A 2-year-old girl was also found in the home but was unharmed, police said. She is in protective custody. 
 
 A motive in the killings has not been determined. Detectives believe several weapons were used, including a small hatchet and knives, Calhoun said. 
 
 Broken Arrow is a city of about 100,000 southeast of Tulsa. ||||| By Lynn Casey 
 
 Quick facts: 
 
 Police responded to a 911 call, one of the young male victims called before dying 
 
 Police five people dead inside a home: the parents and young siblings of the suspects 
 
 16 and 18-year-old boys suspected in the death of their parents and siblings 
 
 18-year-old identified as Robert Bever 
 
 Police said no criminal history that's led to police being called to the location before 
 
 Siblings were homeschooled 
 
 Broken Arrow police told FOX23 because of the investigation they can't reveal what the brothers’ plans may have been after they murdered their family. 
 
 FOX23 found out investigators are looking into a shipment that was supposed to be delivered to the home Thursday. 
 
 Sources said the shipment contained boxes of ammunition. Police said they can't comment on it because of the investigation. They also said if the younger brother didn't call 911 the teens could have had more time before being arrested. 
 
 A shipment headed for the home where five family members were murdered.FOX23 has learned investigators are looking... Posted by FOX23 Lynn Casey on Friday, 24 July 2015 
 
 Police said either the 12- or 7-year-old brother of the accused teens made the 911 call that led police to their home. 
 
 "He did save the life of his 13-year-old sister and his two-year-old sister and possibly many others after that," said Corporal Leon Calhoun with Broken Arrow police. 
 
 David and April Bever and their children two sons aged 12 and 7 and a daughter age 5, were stabbed to death in their home Wednesday night. 
 
 
 
 
 
 
 
 
 
 It was originally reported as an open line call and the arrest and booking report show police thought at one point the 13-year-old survivor made the call. 
 
 “(He) actually stated, ‘Please help,’ and (said) their brother was attacking the family. Another male which we believe is one of the two suspects said hello and then hung up,” said Calhoun. 
 
 Both younger brothers died from their injuries in the attack in their Broken Arrow home. 
 
 Follow FOX23 Lynn Casey on Facebook. 
 
 UPDATE: BAPD just learned it was not the 13-year-old survivor who called 911 but one of the young boys who died.They... Posted by FOX23 Lynn Casey on Friday, 24 July 2015 
 
 Robert Bever, 18, and his 16-year-old brother are accused in their death, both now in the Tulsa County jail. FOX23 talked to the Juvenile Justice division who said neither brother had a juvenile record in Tulsa County. Bever was arrested on five counts of first degree murder and one count of aggravated assault and battery with a deadly weapon. 
 
 The arrest and booking report for Robert Bever shows when police arrived they saw blood around the porch and when they knocked heard a voice inside calling for help, they went in and found the 13-year-old and the other victims. The report shows the unharmed two-year-old was upstairs when police arrived. It shows they saw footprints leading away from the house in the backyard and used the police K9 to track the suspects, later identified to the the son and brother of the victims in the house. 
 
 The 13-year-old girl is in serious condition after surgery, a two-year-old was not injured. Police said they are not releasing the name of the children. 
 
 MORE: Complete coverage of stabbings 
 
 FOX23 found out investigators are looking into a shipment that was supposed to be delivered to the home Thursday. 
 
 Sources said the shipment contained boxes of ammunition. Police said they can't comment on it because of the investigation. 
 
 They did say the suspects could have had a lot of free time had no one called 911. They also said they had no reason to believe the two-year-old was not a target as well.
– 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.