Rival rallies have been staged here with tens of thousands of pro and anti-government protesters flooding the streets in the most serious confrontation in Thailand since the 2010 bloody protests in which over 90 people were killed.
Anti-government protesters 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.
The anti-government protesters broke down the gates to the foreign ministry and after occupying an area of the compound they asked civil servants to leave and not to return to work tomorrow, an official said.
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"Tomorrow we will seize all ministries to show to the Thaksin system that they have no legitimacy to run the country," Suthep Thaugsuban, a former opposition MP, said, addressing the crowd.
"It was a peaceful seizure by the people," Suthep said at a press conference from the finance ministry.
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 the large number of people gathering was a significant expression of the Thai society who want to see a change.