In 2014 the Capital Development Authority declared a war against illegal slums in leafy, affluent Islamabad, saying the areas - known as "katchi abadies" in Urdu and largely populated by Christians and Afghan refugees - are illegal and havens for militants.
The drive rendered hundreds homeless and stirred anger with demonstrations held to try to stop the bulldozers.
The left-wing Awami Workers Party (AWP) launched a Supreme Court bid against the drive, with the court ordering written justification from the CDA for its actions.
The report sparked a swift backlash, with rights activists holding a rally in the capital against what they call the "discriminatory" stance.
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Ammar Rashid of the AWP told AFP the move was "old- fashioned bigotry against minorities and working classes".
"The administrative body has no right to be making decisions about the religious demography of Islamabad," he said.
Official figures on the city's religious demographics are not available, but rights activists have estimated the Christian population at roughly 50,000 out of around 530,000.