PESHAWAR: The candidates backed by Pakistan Tehreek-i-Insaf won most of the tehsil chairman slots in six districts of Khyber Pakhtunkhwa during by-elections on Sunday, according to unofficial results. The by-elections for tehsil chairman slots were held in Chitral, Lower Dir, Charsadda, Mardan, Dera Ismail Khan and Kohistan districts peacefully. In Lower Dir, PTI-backed candidate for Balambat tehsil chairman Shakir Shuiab …