Gelsenkirchen (dpa / lnw) - Three children in Gelsenkirchen were apparently persuaded to rob by a 19-year-old. The 11, 12 and 13-year-old boys stopped two other children on Thursday and demanded money and a cell phone from them. A passer-by stepped in and alerted the police. Officers were able to quickly locate the trio and confront them. The boys said that a 19-year-old had threatened them and instigated the robbery. The 19-year-old was arrested a little later under massive resistance, the police said on Friday.