The Jacksonville Sheriff's Office says the four staged a fight Saturday night inside their dorm and then overpowered staff members who came to break it up.
The four entered a control room, fought the staff members there and pushed buttons that opened the front door. They took a staff member's keys, driving off in a vehicle.
The juveniles still at-large are a 16 year old who was jailed on charges of sexually assaulting a child under 12, and a 17 year old who was charged with burglary.
Details of the two captures were not immediately released.
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