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Police officials survey the site of a suicide bomb explosion in Charsadda, located about 20 km (12 miles) northeast of Peshawar November 10, 2009. Pakistani Taliban militants vowed to fight a tough, protracted guerrilla war against the army on Tuesday as a suicide car-bomber killed up to 20 people in a northwestern town, police said. A suicide bomber in a car set off explosives in a square in the centre of Charsadda killing up to 20 people and wounding at least 30, town police chief Riaz Khan said.