Islamabad: A key suspect in the killing of a Pakistani provincial minister has been arrested by the counter-terrorism department (CTD), a media report said on Tuesday. The suspect, identified as Muhammad Qasim, is a resident of Punjab province’s Attock city. The outlawed Tehreek-e-Taliban Pakistan Qari Sohail group was involved in the suicide attack on Punjab home minister Shuja Khanzada, Geo Tv quoted a spokesman for the CTD as saying. According to the CTD spokesman, Qari Sohail used Qasim Muawia, Amjad Fayaz, Sadaqat and Saddam as suicide bombers. Khanzada and 19 other people were killed on August 16 in an attack on his office in Attock district.