NEW : Jose Carranza , 28 , surrenders in schoolyard shootings case . NEW : Boy , 15 , taken into custody Wednesday night . The Associated Press contributed to this report. `` Innocent people are dying needlessly , unnecessarily and for what ? Slayings shocked Newark , New Jersey , where street violence is common .
NEW : Jose Carranza , 28 , surrenders in schoolyard shootings case . NEW : Boy , 15 , taken into custody Wednesday night . The Associated Press contributed to this report. Slayings shocked Newark , New Jersey , where street violence is common .