One of two brothers charged with the murder of his parents and three siblings in Tulsa, Oklahoma, revealed to police that plans for their attacks were stored on a USB flash drive in the family's home.
The information comes from an affidavit for a search warrant, filed Thursday in district court. It does not say which brother made the statement, but only that the statement was "spontaneously uttered" while being arrested.
Brothers Robert, 18, and Michael Bever, 16, have been charged with first-degree murder in the attack which occurred on July 22.
No details of the brothers' plans were included in the affidavit. An investigator did, however, write that evidence such as dark and bloodstained clothes, a mask and gloves, and electronic devices that could store "information on the planning and execution of a mass homicide" would likely be found inside the home. They also wrote that knives, swords, and machetes, would likely be found as well.
Investigators have requested DNA from the brothers.
No possible motive has been released at this time.
On Thursday a summary of the 911 call from the first minutes of the attack was released by police. The summary was released after a judge ruled that the audio should be made public due to its "gruesome" nature.
The transcript indicates that the dispatcher heard screaming in the background and somebody crying while trying to be quiet.
The call, placed around 11:30 p.m. was reportedly placed from a "disconnected cell."
The first police officer arrived at the scene seven minutes after the call was placed. Within three minutes, he had called for ambulances twice. At 11:44, he called for another squad car because there were "three down with stabbing."
Around 12:00, police found one victim with no pulse in a bedroom and two small children in the bathroom.
At 12:05, the final count of five deaths and one injured teen was confirmed.
The two brothers were tracked down minutes later in the woods behind the house.
Service call records show that three years prior, police had responded to a call at the same house to check a "drunk in public" call at 2 a.m.
Dozens gathered at a memorial vigil at a Baptist church near the Bever's home to honor the victims of the attacks.
At the vigil, crowds cheered for police and firefighters who responded to the scene. Pastors prayed for family members of the victims and city officials said that they would not let the killings define their city, which barely has one homicide per year.
Photo Credit: KFOR