A high school in Colorado was locked down Thursday amid unconfirmed reports that two masked men were seen entering the building.Officers from various law enforcement agencies could be seen outside Boulder High School, and the entrances to the parking lot and the building were blocked off.
Boulder Police spokeswoman Julie Brooks confirmed that the school was locked down and that authorities were on the scene, but she released no further details. She would not confirm a report by KOA Radio that a school staff member had seen masked men entering the building.
Messages left with the principal and the school district were not immediately returned.
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