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CROWN POINT, Ind. — A sheriff in northwestern Indiana says investigators have uncovered a large drug trafficking operation at Crown Point High School.

Lake County Sheriff John Buncich said during a Wednesday news conference that it’s “somewhat unbelievable the amount of drugs that were sold.” Buncich had a bag filled with 5,000 Xanax pills that he said students bought for $10 to $20 each. Officials say the investigation led to the seizure of $65,000 in drugs and cash including the Xanax pills and marijuana.

Officials say the investigation started with the February arrest of Petar Velkov, 20, of Crown Point. The Munster Times reports police think he was working with a network to supply drugs at the high school and nearby colleges. Three juveniles also have been arrested and officials say more arrests are expected.