Speaking to The Express Tribune, a PTA official confirmed they received orders from the government to block IP addresses that lead to the party's website.
The site is inaccessible in Pakistan only and is still online in other countries.
The move comes after activists of the Muttahida Qaumi Movement (MQM) ransacked a private television station before clashing with police Monday evening, leaving at least one person dead and over half a dozen injured.
The violence erupted soon after MQM chief Altaf Hussain gave a telephone address to his supporters in which he castigated the media for not giving due coverage of his workers and allegedly raised anti-Pakistan slogans.
However, PTA officials refused to give any timeline until which the website will remain inaccessible in the country.
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