Nearly two dozen people were arrested Monday night during a raid on an Alpharetta restaurant where patrons were allegedly gambling on the upcoming NCAA basketball tournament, police said.

Alpharetta police spokesman George Gordon said officers and detectives from Milton, Roswell and Johns Creek also took part in the 9 p.m. “surprise raid” on Pepperoni’s Tavern on Old Milton Parkway.

“Alpharetta authorities had previously gathered intelligence regarding the planned operation of a large gambling event,” Gordon said in an email.

“Tonight, authorities moved against the gambling operation and detained approximately 65 people,” Gordon said, adding that police found “a large gambling operation in progress based upon the NCAA basketball tournament.”

Gordon said 23 of those detained were charged with illegal gambling, and the others were interviewed and released, but could face future charges.

He said police confiscated several handguns and an undisclosed amount of cash.

The names of those arrested have not been released.