Posted: Jan 07, 2014 12:45 PM ESTUpdated: Jan 07, 2014 12:45 PM EST

HENRICO, VA (WWBT) -

Dozens of police cars are at Glen Allen High School, including the county's SWAT unit.

Henrico Police and Henrico School officials have not said why the heavy police presence is at the school. 

The officers have blocked off the entrance to the school and have units positioned around the building.

NBC12 has a crew at the scene and is working on details. 

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UPDATE

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