Venezuela's shortages could lead to a humanitarian crisis
17 April 2015 Last updated at 18:25 BST
Venezuela has the biggest oil reserves in the world, yet its economy is in crisis.
Widespread shortages and spiralling inflation are fuelling popular discontent, President Maduro blames the fall in oil prices and interference from the US.
Last month tensions rose further when President Obama imposed economic sanctions against seven Venezuelan officials.
Ian Pannell reports from the Venezuelan capital Caracas.
Produced by the BBC's Lindle Markwell; filmed and edited by Ian Druce