People wait in a queue to buy staple items and basic food at a sidewalk near a supermarket in Caracas, Venezuela September 14, 2016. REUTERS/Henry Romero

An opposition supporter takes part in a rally to demand a referendum to remove Venezuela's President Nicolas Maduro, in Caracas, Venezuela, September 16, 2016. REUTERS/Henry Romero

Venezuela's President Nicolas Maduro speaks during his weekly broadcast "En contacto con Maduro" (In contact with Maduro) in Caracas, Venezuela September 13, 2016. Miraflores Palace/Handout via REUTERS

Supporters of Venezuela's opposition face police officers who are blocking a street, as they take part in a rally to demand a referendum to remove Venezuela's President Nicolas Maduro, in Caracas, Venezuela, September 16, 2016. REUTERS/Henry Romero

Lilian Tintori (C), wife of jailed Venezuelan opposition leader Leopoldo Lopez takes part in a rally to demand a referendum to remove Venezuela's President Nicolas Maduro, in Caracas, Venezuela, September 16, 2016. REUTERS/Henry Romero

Supporters of Venezuela's opposition (R) face riot police officers who are blocking a street, as they take part in a rally to demand a referendum to remove Venezuela's President Nicolas Maduro, in Caracas, Venezuela, September 16, 2016. REUTERS/Stringer FOR EDITORIAL USE ONLY. NO RESALES. NO ARCHIVES.

Supporters of Venezuela's opposition face police officers who are blocking a street, as they take part in a rally to demand a referendum to remove Venezuela's President Nicolas Maduro, in Caracas, Venezuela, September 16, 2016. REUTERS/Henry Romero

People wait to buy staple items and basic food outside a supermarket in Caracas, Venezuela September 14, 2016. REUTERS/Henry Romero