The convoy included both military and civilian vehicles . NEW : Islamabad 's Prime Minister Shahidullah Shahid condemns attack , cancels Davos trip . NEW : Main Pakistani Taliban faction claims responsibility , calls for fresh talks . Pakistani Taliban spokesman : Bombing was to avenge the death of a TTP commander . The blast strikes a convoy of military and civilian vehicles , killing At least 22 people .
NEW : Islamabad 's Prime Minister Shahidullah Shahid condemns attack , cancels Davos trip . NEW : Main Pakistani Taliban faction claims responsibility , calls for fresh talks . Pakistani Taliban spokesman : Bombing was to avenge the death of a TTP commander . The blast strikes a convoy of military and civilian vehicles , killing At least 22 people .