CUCUTA, Colombia/URENA, Venezuela (Reuters) – Venezuelan troops fired tear gas at angry protesters unable to cross into Colombia on Saturday after President Nicolas Maduro closed the border to stop the opposition bringing U.S. humanitarian aid into the South American nation.

Demonstrators set up barricades and burned tires in the Venezuelan border town of Urena, as attention turned to whether National Guard troops stationed at the border crossing would fulfill Maduro’s orders to block humanitarian aid from reaching a sick and hungry population.

Four National Guard troops at the frontier disavowed Maduro’s socialist government on Saturday, following an appeal from Venezuelan opposition leader Juan Guaido to let aid through.

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