18th Street gang members have been charged in the stabbing death of 15-year-old Dennys Guzman-Saenz

Twenty-two-year-old Francis Artiga-Cardoza, of Manassas, was arrested in Worcester, Mass., early Tuesday morning. Hours later, police arrested 17-year-old Ana Villatoro in the District. The pair, along with seven other suspected 18th Street members, are charged with first-degree murder, kidnapping and armed robbery.Two more suspected 18th Street gang members have been charged in the stabbing death of 15-year-old Dennys Guzman-Saenz in a Gaithersburg park, Montgomery County police said.Police say the 18th Street gang members abducted Guzman-Saenz from a Hyattsville bus stop Jan. 18., believing he was a member of arch rival gang MS-13.Guzman-Saenz was found Jan. 19 in Malcolm King Park, stabbed about 40 times. An anonymous tip led police to his accused killers.