A Bucks County man has been arrested after he allegedly used an Internet chat room to sexually proposition a detective posing as a child.

Christopher Brian McGee, 29, of Fairless Hills, was charged with unlawful contact with a minor and criminal use of a communication facility. McGee repeatedly made contact with the "13-year-old girl," sending her explicit photos, posing nude in front of a Web cam, and suggesting they meet, according to an affidavit.

McGee allegedly used a neighbor's open wireless Internet connection. The attorney general's Child Predator Unit announced McGee's arrest along with the arrests of three men from Lancaster and Carbon Counties and Ludlow, Mass.