Many dead in Pakistan blast

But another security official said up to 20 people were feared dead, 

The blast had happened outside the office of Riaz Hussain, a local PPP  candidate

Al Jazeera’s Kamal Hyder, reporting fro Islamabad, said that the area was rife with sectarian clashes for a long time.

He said: “The motive of the blast may or may not be linked with the election.”