ST. CLOUD -- Four men were arrested as part of a sex trafficking and prostitution sting in the St. Cloud area. St. Cloud Police along with the Minnesota Bureau of Criminal Apprehension and police departments from Minneapolis, Woodbury, St. Paul, and Plymouth conducted Operation Guardian Angel last Thursday.

Officers placed online ads targeting people who were willing to pay money to have sexual encounters with young girls.

Four men were arrested in the sting and face felony charges of solicitation of a minor. Police say the four men who were booked into jail are 39-year-old Ryan Mulliner of St. Cloud, 25-year-old Samuel Kalkbrenner of Amery, Wisconsin, 61-year-old Dwight Lorensen of Litchfield and 25-year-old Bradley Nelson of Foley.

The men were arrested when they showed up at a St. Cloud hotel expecting to meet the girl.