The platform remained inaccessible to users but government officials refused to acknowledge any restrictions, until now.
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Khan and his wife Bushra Bibi were each handed a 14-year sentence in the case in January.
Last month’s vote saw large-scale allegations of rigging which PTI says was done to stop it from coming to power.
Pakistani lawmakers vote for return of widower of Benazir Bhutto after elections marred by rigging claims.