A suicide bomber detonated an explosives-laden vehicle at a roadside police checkpoint in northwestern Pakistan on Saturday, killing at least 11 people and wounding about 30 others, officials said, in a sign of increasing violence in the region bordering Afghanistan. The attack occurred in Dera Ismail Khan, a district in Khyber Pakhtunkhwa province, said Bilal Faizi, a spokesman for the provincial emergency service. Local police chief Safdar Baloch said most of those killed and wounded were...