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Police say Dr Niaz's body shows signs of torture
Event features engaging discussions, keynotes from prominent figures
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Sources say cleaning tax will be imposed on every household, shop and plaza
Event will feature diverse speakers from literary world, performances & book fair
Pindi police say one assailant arrested, two at large
PAC official reiterates global significance of artists as messengers of peace
Sources say gang used social media to lure unsuspecting citizens