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By Phil Helsel

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.

The Associated Press contributed.