The additional police and barricade around the Bangladesh Nationalist Party (BNP) chief's upmarket Gulshan district office here was removed around 3 am local time.
"They (police) first removed their vans at around 2.30 am and afterwards they left the scene along with water cannons," a BNP official told reporters adding that few policemen were left behind for routine duty.
Though the 69-year-old Zia welcomed the government's decision to end her virtual house arrest, she asked her supporters to continue with the agitation despite "repression and oppression by the government".
"The government forced [us] to call the blockade. It will continue until further announcement," she said.
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She also asked the government to release all her partymen, withdraw cases against them, return people's voting rights and "create atmosphere for an inclusive election".
The surprise move to end Zia's confinement coincided with the 79th birth anniversary of her husband and BNP's founder Ziaur Rahman.
State minister for home Asaduzzaman Khan Kamal last night said Zia would not be barred from visiting Rahman's grave and she could move anywhere after offering wreaths there.
The siege around her office triggered renewed political unrest across Bangladesh that has left 28 people dead.
During the siege at the two-story building, the opposition leader called a nationwide transport blockade, with the opposition party activists firebombing buses, cars and other vehicles, leading to police retaliate by firing bullets and tear gas.
The opposition boycotted the polls over their demand to hold the polls under a neutral caretaker government.