ISLAMABAD: After failing to obtain permission from the district administration to hold a workers’ convention on August 5 , the Islamabad chapter of Pakistan Tehreek-i-Insaf (PTI) has announced it will begin an unarmed but political “guerrilla struggle” from Sunday (today). PTI Islamabad chapter head Aamir Mughal said that, under the “guerrilla struggle,” they would block various main roads and share …