Bus explosion in Pakistan

A relative of one of the victims who was killed in a bomb blast targeting a bus transporting government officials at the scene of the explosion.  (Bilawal Arbab / EPA)

Pakistani security officials inspect the site of a bomb blast targeting a bus transporting government officials of the Civil Secretariat.  (Bilawal Arbab / EPA)

Pakistani men push a stretcher carrying an injured blast victim to a hospital in Peshawar.  (Hasham Ahmed / AFP / Getty Images)

A bomb blast ripped through a Pakistani bus, killing at least 19 people, including six women and a child, on the outskirts of Pakistan’s northwestern city of Peshawar.   (A. Majeed / AFP / Getty Images)

Pakistani police officers check the wreckage of a bus that exploded when a bomb planted in it went off on the outskirts of Peshawar.  (Mohammad Sajjad / Associated Press)

Pakistani security officials, reflected in a bus mirror, inspect the site of a bomb blast targeting a bus transporting government officials of the Civil Secretariat.  (Bilawal Arbab / EPA)