BISMARCK, N.D. (AP) — A teenager accused of making a threat that prompted a lockdown at the third-largest college in North Dakota's university system was arrested on a Minot-area school bus.

Highway Patrol Capt. Eric Pederson tells KXMB-TV authorities were able to track the 16-year-old boy through his cellphone.

Bismarck State College was put on lockdown for more than four hours last Thursday after the boy allegedly threatened on Twitter to shoot up the school's library with a machine gun. No weapons were found on the bus when it was stopped near Washburn and the boy was taken into custody.

FBI spokesman Kyle Loven says no charges have been filed but the investigation continues. He says juveniles can be charged in federal court, but it's rare.

BSC has nearly 4,100 students.

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