The protesters want Prime Minister Imran Khan resign over economic hardships.
Authorities were seen moving additional rows of massive shipping containers onto roads leading to the “Red Zone.”
Firebrand cleric Maulana Fazlur Rehman, leader of the Jamiat Ulema-e-Islam party, says Khan has until Sunday night to quit.
Rehman has hinted he may lead protesters to the Red Zone to force Khan’s resignation. Khan says he won’t succumb to pressure.
Rehman’s all-male supporters’ caravan initially banned women journalists from covering the protest.