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MANASSAS, Va. (WUSA9) -- Prince William County Public Schools officials say students and staff are returning to New Dominion Alternative Center at 8220 Conner Dr. in Manassas after a precautionary evacuation.

Monday morning, the school was evacuated due to the smell of gas.

Emergency crews responded and determined that the smell was from sewer gas, say officials.

The all clear has been given for the students to return to the building.

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