The Latest on the case of two Oklahoma brothers accused of fatally stabbing their parents and three siblings (all times local):

3:35 p.m.

A detective says an Oklahoma teenager occasionally laughed while confessing that he and his brother repeatedly stabbed their parents and siblings, and planned to make videos of the scene before shooting other people.

Broken Arrow Police Detective Eric Bentz testified during a hearing Tuesday that Robert Bever seemed "mildly excited" to discuss the July attack at the family's home in the Tulsa suburb.

Bentz says Bever explained how he and his 17-year-old brother, Michael, planned to kill their family, stuff their bodies into bins, make a video showing the bodies and put the bins in the attic.

Bever told the detective they then planned to take the family vehicle, along with guns and ammunition, to randomly attack other locations and kill 10 people at each place.

Prosecutors say their father was stabbed 28 times and their mother had at least 48 wounds. Three of their siblings also were killed.

Prosecutors plan to call a teenage sister who survived the attack to testify at the hearing.

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6:40 a.m.

Two Oklahoma teenagers are due in court to face accusations they stabbed their parents and three siblings to death in a rampage last summer.

Nineteen-year-old Robert Bever (BEH-vuhr) and 17-year-old Michael Bever have pleaded not guilty to first-degree murder. Tuesday's hearing is for the judge to determine if there is enough evidence to proceed with a trial.

Prosecutors say the brothers planned the attack at the family's home in the Tulsa suburb of Broken Arrow. Their father was stabbed 28 times and their mother had at least 48 wounds. Prosecutors plan to call a teenage sister who survived the attack to testify at the hearing.

A judge rejected Michael Bever's request to be tried as a juvenile.