The NA-120 seat in Lahore, said to be the stronghold of the Sharifs, fell vacant on July 28 after the apex court disqualified Sharif in the Panama Papers case.
The voting started at 8 am and it will continue till 5pm. A total of 44 candidates are in the fray. The Pakistan Army personnel have been supervising the polling process.
"For the first time in the history of Pakistan, Biometric Voter Verification Machines are also being tested in the Constituency. Some 30,000 voters will be polling their votes on biometric machines," Dawn reported.
A close contest is expected between Kulsoom and cricket- turned-politician Imran Khan's Pakistan Tehreek-i-Insaf candidate Dr Yasmin Rashid. There are more than 320,000 registered voters in the constituency.
Kulsoom is in London where she is undergoing treatment for her throat cancer. In her absence, Maryam Nawaz had run her mother's campaign.
Maryam had said yesterday that the people will cast the vote in favour of Begum Kulsoom with a pledge that they will not allow anyone to insult the ballot.
This constituency has thrice elected Sharif as the country's prime minister since 1990. Sharif had won the National Assembly (NA) seat from the area for the first time in 1985. He vacated it and became Punjab chief minister.
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