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.

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.