BERWYN, Pa. (WPVI) -- Classes have resumed Thursday at Conestoga High School in Berwyn, Chester County, after a bomb threat.

Police say the threat was received by the 911 call center around 5:50 a.m. on Thursday.

Officers are currently on scene and working closely with school officials.

"Our department, with assistance from K-9 units and a drone team, has completed a search of the building and determined it to be clear," police said just after 11 a.m.

The Tredyffrin/Easttown School District had delayed the start of classes until they got the all clear.

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