Allies of two Venezuelan opposition leaders say Leopoldo Lopez and Antonio Ledezma have been taken by authorities from the homes where they were under house arrest.
Video posted on the Twitter account of Lopez's wife early Tuesday shows a man being taken away from a Caracas home by state security agents.
Wife Lilian Tintori says in a tweet that "they've just taken Leopoldo from the house. We don't know where he is."
Lopez was detained three years after protests against President Nicolas Maduro's government and sentenced to more than a decade in prison on charges that include inciting protesters to violence. He was released last month to serve the rest of his term under house arrest.
Ledezma, a former Caracas mayor, was also detained in 2015 and has been under house arrest.
Ledezma's daughter: "We blame this regime. They took him. We don't know where he is."