The 46-year-old beleaguered premier and her nine cabinet ministers were today dismissed from office by a Constitutional Court that found her guilty of abuse of power.
Her Pheu Thai party said the court's ruling was "a virtual coup against a democratic government".
The party has called on the people, who disagreed with the ruling, to express their opposition through "peaceful demonstrations or any other peaceful way".
Pheu Thai would send its former MPs to meet their constituents to explain the party's belief that the ruling was a conspiracy against it, the party said in a statement.
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Yingluck has denied she had a part in the transfer of Thawil Pliensri from the position of National Security Council secretary general.
Yingluck later appeared live on national television and thanked her supporters.
"We held true to the principles of honesty in running the country, and never acted corruptly, as we were accused," said Yingluck, who has been accused of acting as a proxy for her fugitive brother Thaksin Shinawatra.