Pedro Felix Camacho, 21, of 25 Queen St., Worcester, has been charged with armed assault to murder. He is being held without bail following his arraignment in Worcester Central District Court Monday, according to the office of Worcester District Attorney Joseph D. Early Jr. Camacho was arrested by Worcester police over the weekend. A dangerousness hearing has been scheduled by Judge Andrew Abdella for Camacho Wednesday. Camacho's arraignment follows those of Celestine Bigirimana, 22, and Mohamed Abdullahi, 19, for the same incident. Bigirimana is charged with assault and battery with a dangerous weapon, resisting arrest, disturbing the peace, and disorderly conduct. Abdullahi is charged with assault and battery with a dangerous weapon.