Mexico City (AFP) - Mexicans awakened Monday without the familiar radio voice of a prominent journalist who revealed the first lady's controversial mansion.

Carmen Aristegui, a fixture of morning broadcasts, was fired by MVS Radio late Sunday after a public feud with her employer over the dismissal of two of her investigative reporters.

Her firing became the top trending topic on Twitter in Mexico, with supporters calling on users to unfollow MVS's account over what they consider an affront to freedom of speech.

Aristegui showed up Monday in front of MVS's Mexico City headquarters, where she was greeted by a dozen cheering supporters.

Vowing to fight back, she warned that her lawyers said her firing was wrong and a violation of freedom of speech.

Aristegui said her country "is seeing an authoritarian wind and an ominous sign of something that we have to avoid."

"This team of journalists is committed to fighting for freedom of speech," she said, adding that her firing appeared to have been planned well in advance, "with much resources and much power."

MVS said it parted ways with Aristegui because she had conditioned her staying with the broadcaster on the company reinstating her two reporters, and the company could not accept such "conditions and ultimatums."

MVS said the two journalists had been fired for using the company's name without permission in their participation in MexicoLeaks, a website created by civic groups and other media outlets to receive leaked documents showing acts of corruption.

- Lavish mansion -

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Mexico journalist who revealed first lady mansion fired