Polling for 2013 general election started across the country where masses will cast their vote to elect their representatives for the next five-year term.
Long queues of people were seen outside polling stations well before the start of polling.
Tight security arrangements have been made across the country to ensure peaceful, free and transparent elections.
The 63-year-old Nawaz Sharif-led PML-N is widely tipped to emerge as the single largest party in the polls.
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A spirited campaign over the past few weeks by cricketer-turned-politician Imran Khan, 60, has boosted the chances of his Pakistan Tehrik-e-Insaf party, particularly in Punjab province which has 147 - or more than half - of the 272 parliamentary seats for which polls will be held.
Some experts point out that Khan, who is hospitalised after having fallen down from a forklift during campaign, could gain some sympathy votes.
Over 86 million people are registered to vote but elections in Pakistan have traditionally registered low turnouts.