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HARRISBURG, Pa. (CBS/AP) — In the first full month of sports betting, Pennsylvania saw gamblers wager just over $16 million at three casinos.

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Thursday’s report by Pennsylvania state regulators includes December results for sports betting at Hollywood Casino at Penn National Race Course near Hershey, Rivers Casino in Pittsburgh and SugarHouse Casino in Philadelphia.

For comparison, New Jersey’s casino and racetrack-based sports books took in $319 million worth of bets in December.

Parx Casino Wraps Up First Day Of Sports Betting

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A fourth Pennsylvania casino, Parx Casino in suburban Philadelphia, opened its sports book in January.

A year-old state law allows owners of Pennsylvania’s 12 casinos to pay a $10 million fee to operate sports betting. States are increasingly legalizing sports betting after the U.S. Supreme Court cleared the way in May.

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(© Copyright 2019 CBS Broadcasting Inc. All Rights Reserved. The Associated Press contributed to this report.)