COTABATO CITY, Philippines — Officials on Saturday took turns appealing for public cooperation in putting a stop to the unending killings in the troubled Pikit town in Cotabato province. More than 30 people have been killed in one gun attack after another in Pikit in the past 24 months and two men were injured in a grenade blast in its town proper Friday afternoon. A member of the 80-seat Bangsamoro parliament, the physician Kadil Sinolinding, said Saturday there is an urgent need for cross-section support to the police and military peacekeeping missions in Pikit. Most of the killings in the M…