Rival rallies have been staged here with tens of thousands of pro and anti-government protestors flooding the streets in the most serious confrontation in Thailand since the 2010 bloody protests in which over 90 people were killed.
The anti-government protestors want Yingluck to step down amid claims that her government was remote-controlled by her older brother, ousted former premier, Thaksin Shinawatra.
Thaksin has lived in a self-imposed exile in Dubai to avoid jail on a corruption conviction. Protestors entered the Finance Ministry compound even as they were asked by their leader Suthep Thaugsuban, a former opposition MP, not to damage anything.
"Tomorrow we will seize all ministries to show to the Thaksin system that they have no legitimacy to run the country," Suthep said, while addressing the crowd.
The protestors earlier chanting "Thaksin get out, army come in", called for the intervention of the military in a country that has seen 18 actual or attempted coups since it became a constitutional monarchy in 1932.
Thailand's Opposition Democrat Party leader and former Premier Abhisit Vejjajiva today urged Prime Minister Yingluck and the ruling Pheu Thai Party to take responsibility for the ongoing protests.
He said that the gathering of a large number of people was a significant expression of Thai society wanting to see a change.

"It's a pity that we do not see how the PM and the government will respond to the call. They just repeatedly say 'please sit and talk'," Abhisit said.
He said the march across Bangkok by the anti-government protestors would not affect the no-confidence debate scheduled for Tuesday and Wednesday. Abhisit further said the opposition party, which has prepared more than 20 MPs for the debate, is ready to expose the government's corruption scandals.
The opposition has submitted no-confidence motion against Prime Minister Yingluck and Interior Minister Charupong Ruangsuwan. Meanwhile, as pro and anti-government protestors from the provinces came to Bangkok, Pheu Thai Party spokesman Prompong Nopparit said all party MPs would convene today to prepare for the no-confidence debate.
He declared that the government had no intention of calling for a House dissolution. Prompong said that former Democrat Suthep could lead supporters to Parliament and to Government House on Tuesday, in an attempt to block the no-confidence vote to create a political deadlock.


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