Thirteen people were killed and over 40 others injured in three bomb attacks in the southern port city of Karachi.
The first blast went off near the election office of Amanullah Mehsud, an Awami National Party candidate contesting polls to the Sindh Assembly.
Mehsud escaped unhurt though several ANP workers were among the dead and injured.
The second blast went off minutes later near a polling station and an ANP office in the same area as rescue teams were busy rushing the victims of the first attack to hospital.
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Two persons were killed and several injured when a bus was
targeted by the third blast at Qasba Colony in Karachi.
Two policemen were killed and four others injured in an explosion at Toorghar in Peshawar. In Peshawar, a bomb attached to a motorcycle went off outside a women's polling station, injuring eight persons.
Five persons were wounded when a suicide bomber detonated his explosive vest after he was intercepted by police outside another polling station in a suburb of Peshawar.
Several persons were injured in a blast in Quetta, the capital of the restive southwestern province of Balochistan.
Several ANP and MQM members, including candidates, were killed in Taliban attacks.
Days before the polls, the Taliban threatened it would carry out attacks, including suicide bombings, on election day. The threat heightened concerns about security for the polls, which mark the first democratic transition of power in Pakistan's history.