Pinal County sheriff’s officials said they've arrested an Apache Junction elementary school principal after an investigation into online ads soliciting teen girls to go skinny dipping.

Four Peaks Elementary School Principal Karl Judd Waggoner was arrested on charges of luring a minor Tuesday. Officials said an undercover officer posing as a 14-year-old girl engaged Waggoner in an online conversation after spotting one of the ads. Waggoner allegedly discussed engaging in sex acts with the undercover detective.

Sheriff Mark Lamb said in a statement that the 59-year-old educator was posting online ads seeking underage girls as recently as this weekend. Sheriff Lamb said Waggoner spent decades teaching middle and high-school students in Texas – and that deputies are checking for victims there.