"The blockade will now continue till 5:00 p.M. Thursday," BNP spokesperson and joint secretary general Salahuddin Ahmed said in messages sent to media houses.
The opposition protest, which was scheduled to end tomorrow, would virtually paralyse the country straight for the second week, even as death toll in the last two-week's of political violence rose to 28.
The extension came as the deadline to file nomination papers for the upcoming January 5 elections expires today.
The ruling Awami League and BNP are at loggerheads over the system for conducting the polls. Prime Minister Sheikh Hasina has formed a multi-party interim set-up while the BNP wants elections under a non-party interim government.
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The opposition led by BNP is demanding that the polls should be shelved until the dispute is settled.
The crisis prompted UN High Commissioner for Human Rights Navi Pillay to warn that Bangladeshi politicians might face prosecution at the International Criminal Court.
"In other situations, we have seen cases of political or election related violence where the perpetrators of such acts - including political leadership - have faced prosecution," Pillay said yesterday.
Her comments came ahead of a high-level UN political mission's visit to Dhaka this week for talks with AL and BNP.
UN secretary general Ban-Ki-moon took new initiatives last week to end the political deadlock sending letters afresh to Prime Minister Hasina and her arch-rival BNP chief Khaleda Zia as the political deadlock resulted in widespread violence.
Chief Election Commissioner Kazi Rakibuddin Ahmed said yesterday "anything is possible" if the political parties reach a consensus but added that otherwise the commission would go ahead with the polls plan.