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The PTI is the country's biggest opposition party.
In a major legal victory for the jailed former PM, the Court ruled that his party was eligible for more than 20 seats reserved for women and minorities in Parliament.
Pakistan Muslim League-Nawaz president Shehbaz Sharif will become PM again, and PPP co-chairman Asif Ali Zardari will be the joint candidate for the president's office.
He contested and won a seat in the election despite his absence from the campaign.
PTI leaders claim they would have won even more seats if not for vote rigging.
Sharif has said his party will start discussing the formation of a coalition government.
The government said it suspended mobile phone services ahead of the election on Thursday as a security measure, and they were being partially resumed.
Thousands of troops were deployed on the streets and at polling stations across the country and borders.
Sharif, 74, will be eyeing the premiership for a record fourth time in Thursday's election.
Accountability Court Judge Mohammad Bashir conducted the hearing at Rawalpindi's Adiala Jail, where the former premier is incarcerated, in the Toshakhana corruption case.
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