The 19-year-old man charged with attempted murder in the shooting of two young girls attending an end-of-year school picnic had flashed gang signs before gunfire erupted from the Jeep he was riding in, a prosecutor said Sunday. Raekwon Hudson, wearing a torn and tattered green sweatshirt, showed little reaction when Cook County Judge Peggy Chiampas ordered him to remain in jail. “No bail! Take him back!” Chiampas shouted to her courtroom sheriff’s deputies after voicing her disgust. “Young children in this city can’t participate in a picnic without being in fear of their lives because of gangbangers on the street...