The polls are open in Pakistan where tens of millions of people are expected to take part in the country's historic election.
The vote Saturday marks the first time that a democratically elected civilian government finishes its term and hands over power to another.
The election has been marred by repeated Taliban attacks, mostly against liberal secular parties who have supported military operations against the militants.
The frontrunner is the Pakistan Muslim League-N, headed by two-time prime minister Nawaz Sharif. But he has been getting strong competition from cricket star turned political leader, Imran Khan who has been capitalizing on a desire for change among frustrated voters.
The incumbent Pakistan People's Party is not expected to fare well after years of militant attacks and power outages.