Trevor Bickford, 19, entered court Monday in shackles wearing grey sweatpants and a grey sweatshirt over a white tee shirt.
He answered the judge's questions in a quiet, low voice.
He is charged with attempting to kill officers working with the federal government to secure the ball drop.
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Bickford was taken into federal custody Monday morning following his release from the hospital.
He is scheduled to appear later this week in state court where he faces separate charges.
A federal magistrate appointed counsel and held the defendant without bail pending an application for bail at a later date.
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