Venezuela’s opposition said its banned leader María Corina Machado was detained after she emerged from hiding to join thousands of Venezuelans protesting against Nicolás Maduro’s planned inauguration after what they say is a fraudulent reelection.

María Corina Machado, the driving force of Venezuela’s opposition movement, was arrested by government security forces Thursday as she left a rally in Caracas, a day before President Nicolás Maduro plans to take office for a third term.