Violence mars conclusion of campaign in Pakistan

A major security operation is being put in place in Pakistan, ahead of general elections on Saturday.

Ahead of the polls, a bomb hit a campaign office of the Pakistan People's Party in Balochistan province.
Meanwhile, at least three people were also killed in an attack in Miranshah, in North Waziristan.

Al Jazeera's Imtiaz Tyab reports from Lahore.