According to the criminal complaint, the suspects had been planning the attack since February.
They first thought to kill the victim by placing duct tape over her mouth while she was sleeping and stabbing her in the neck, the complaint says.
Next, the plan was to kill her in a park bathroom where there was a floor drain that could make cleanup easier, it continued.
But, finally, the girls decided to carry out the attack in the park while playing a game of hide-and-seek, the complaint says.
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