An influential Mexican broadcast journalist whose report about the first lady's mansion caused a scandal was fired on Sunday, sparking anger among supporters who called her firing an affront to freedom of speech.

Carmen Aristegui had been publicly feuding with her employer, MVS Radio, in recent days after two of her investigative reporters were fired by the company.

She complained about the dismissals on the air on Friday, demanding that her colleagues be reinstated and lamenting about an "authoritarian wind" in the country.