Venezuela's President Nicolas Maduro delivers a speech during a meeting of leaders of the member states of the Bolivarian Alliance for the Peoples of Our America and the Treaty of Commerce and Promotion (ALBA-TCP),

Venezuela opposition leader Maria Corina Machado was detained at a march in Caracas on Thursday in her first public appearance in months and her ally, former presidential candidate Edmundo Gonzalez, demanded she be freed immediately.

Venezuelan opposition supporters protested around the country in a last-minute effort to put pressure on President Maduro the day before he is to be sworn in for his third term.