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Venezuelan National Guard riot control vehicles overrun a group of opposition activists equipped with protective helmets and gloves, gas masks and carrying makeshift shields during a protest against President Nicolas Maduro in Caracas, on May 10, 2017. Venezuelan protesters hit the streets on Wednesday armed with "Poopootov cocktails," jars filled with excrement which they vowed to hurl at police as a wave of anti-government demonstrations turned dirty. / AFP PHOTO / JUAN BARRETO (Photo credit should read JUAN BARRETO/AFP/Getty Images)

Venezuelan National Guard riot control vehicles overrun a group of opposition activists equipped with protective helmets and gloves, gas masks and carrying makeshift shields during a protest against President Nicolas Maduro in Caracas, on May 10, 2017. Venezuelan protesters hit the streets on Wednesday armed with "Poopootov cocktails," jars filled with excrement which they vowed to hurl at police as a wave of anti-government demonstrations turned dirty. / AFP PHOTO / JUAN BARRETO (Photo credit should read JUAN BARRETO/AFP/Getty Images)
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CARACAS, VENEZUELA - MAY 8: A Venezuelan opposition activist, equipped with protective helmet, gloves and a makeshift shield, throws back a tear gas canister shot by riot police during clashes ensuing a protest against President Nicolas Maduro, in Caracas, Venezuela on May 8, 2017. Venezuela's opposition mobilized Monday in fresh street protests against President Nicolas Maduro's efforts to reform the constitution in a political crisis. Supporters of the opposition Democratic Unity Roundtable (MUD) gathered in eastern Caracas to march to the education ministry. (Photo by Carlos Becerra/Anadolu Agency/Getty Images)

CARACAS, VENEZUELA - MAY 8: A Venezuelan opposition activist, equipped with protective helmet, gloves and a makeshift shield, throws back a tear gas canister shot by riot police during clashes ensuing a protest against President Nicolas Maduro, in Caracas, Venezuela on May 8, 2017. Venezuela's opposition mobilized Monday in fresh street protests against President Nicolas Maduro's efforts to reform the constitution in a political crisis. Supporters of the opposition Democratic Unity Roundtable (MUD) gathered in eastern Caracas to march to the education ministry. (Photo by Carlos Becerra/Anadolu Agency/Getty Images)
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Opposition activists, equipped with helmets, gas masks, makeshift shields and barricaded behind debris, face charging riot police during a protest against Venezuelan President Nicolas Maduro, in Caracas on May 3, 2017. Venezuela's angry opposition rallied Wednesday vowing huge street protests against President Nicolas Maduro's plan to rewrite the constitution and accusing him of dodging elections to cling to power despite deadly unrest. / AFP PHOTO / JUAN BARRETO (Photo credit should read JUAN BARRETO/AFP/Getty Images)

Opposition activists, equipped with helmets, gas masks, makeshift shields and barricaded behind debris, face charging riot police during a protest against Venezuelan President Nicolas Maduro, in Caracas on May 3, 2017. Venezuela's angry opposition rallied Wednesday vowing huge street protests against President Nicolas Maduro's plan to rewrite the constitution and accusing him of dodging elections to cling to power despite deadly unrest. / AFP PHOTO / JUAN BARRETO (Photo credit should read JUAN BARRETO/AFP/Getty Images)
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An opposition activist wearing protective helmet and gloves and a gas mask, takes cover behind a makeshift shield decorated with a scornful image of Venezuela's President Nicolas Maduro during a protest in Caracas on May 8, 2017. Venezuela's opposition mobilized Monday in fresh street protests against President Nicolas Maduro's efforts to reform the constitution in a deadly political crisis. Supporters of the opposition Democratic Unity Roundtable (MUD) gathered in eastern Caracas to march to the education ministry under the slogan "No to the dictatorship." / AFP PHOTO / FEDERICO PARRA (Photo credit should read FEDERICO PARRA/AFP/Getty Images)

An opposition activist wearing protective helmet and gloves and a gas mask, takes cover behind a makeshift shield decorated with a scornful image of Venezuela's President Nicolas Maduro during a protest in Caracas on May 8, 2017. Venezuela's opposition mobilized Monday in fresh street protests against President Nicolas Maduro's efforts to reform the constitution in a deadly political crisis. Supporters of the opposition Democratic Unity Roundtable (MUD) gathered in eastern Caracas to march to the education ministry under the slogan "No to the dictatorship." / AFP PHOTO / FEDERICO PARRA (Photo credit should read FEDERICO PARRA/AFP/Getty Images)
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AFP FEDERICO PARRA

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Demonstrators scatter as a National Guard riot control vehicle charges during a protest against President Nicolas Maduro in Caracas, on May 10, 2017. Venezuelan protesters hit the streets on Wednesday armed with "Poopootov cocktails," jars filled with excrement which they vowed to hurl at police as a wave of anti-government demonstrations turned dirty. / AFP PHOTO / JUAN BARRETO (Photo credit should read JUAN BARRETO/AFP/Getty Images)

Demonstrators scatter as a National Guard riot control vehicle charges during a protest against President Nicolas Maduro in Caracas, on May 10, 2017. Venezuelan protesters hit the streets on Wednesday armed with "Poopootov cocktails," jars filled with excrement which they vowed to hurl at police as a wave of anti-government demonstrations turned dirty. / AFP PHOTO / JUAN BARRETO (Photo credit should read JUAN BARRETO/AFP/Getty Images)
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AFP JUAN BARRETO