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Riaz is contesting against independent candidate Usman Nisar Pannu.
The by-polls in this constituency was announced after the demise of MPA Khurram Gulfam of Pakistan Muslim League-Nawaz (PML-N).
Earlier on Thursday, Pannu's supporters had allegedly attacked Riaz's vehicle, injuring 13 people near the Pakhyana polling station.
Heavy contingents of police and Rangers were summoned and polling was stopped at that particular station. PP-162 has 123 polling stations.
The by-election was previously scheduled to be held on September 26 but was rescheduled by the Election Commission of Pakistan (ECP) owing to floods.
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