A roadside bomb struck an election convoy of Pakistan’s main opposition party on Tuesday, killing four people

A roadside bomb struck an election convoy of Pakistan's main opposition party on Tuesday, killing four people, police and officials said, the third deadly attack on political targets in as many days.
  
Sanaullah Zehri, the head of the Pakistan Muslim League-N in southwestern Baluchistan province, was on the campaign trail for the May 11 general election when the blast hit his convoy in Khuzdar district, 350 kilometres (220 miles) south of provincial capital Quetta.
  
Zehri survived the attack but his son, brother, nephew and their guard were all killed, officials said. "An improvised explosive device went off as Zehri, leading a convoy of more than 20 vehicles, left his home to campaign in Khuzdar," provincial home secretary Akbar Durrani told AFP. Local police confirmed the attack.