Pakistan Tehrik-e Insaf (PTI), the party headed by cricket-star-turned politician Imran Khan, has named CIA director John Brennen and the CIA station chief in Islamabad, Craig Osth as the principal accused in the murder of six people in a drone strike on a madrassa in Tall, Hangu district of Khyber Pakhtunkhwa district. PTI Information Secretary Dr Shireen Mazari made the announcement at a press conference in Islamabad on Monday.