Opposition supporters and students cross a barricade during clashes with riot police in Caracas, Venezuela, Monday, April 15, 2013. National Guard troops dispersed students protesting the official results of Venezuela's disputed presidential election. Opposition candidate Henrique Capriles has challenged his narrow loss to Nicolas Maduro and is demanding a recount. (AP Photo/Fernando Llano)

Associated Press
Opposition supporters and students cross a barricade during clashes with riot police in Caracas, Venezuela, Monday, April 15, 2013. National Guard troops dispersed students protesting the official results of Venezuela's disputed presidential election. Opposition candidate Henrique Capriles has challenged his narrow loss to Nicolas Maduro and is demanding a recount. (AP Photo/Fernando Llano)
Opposition supporters and students cross a barricade during clashes with riot police in Caracas, Venezuela, Monday, April 15, 2013. National Guard troops dispersed students protesting the official results of Venezuela's disputed presidential election. Opposition candidate Henrique Capriles has challenged his narrow loss to Nicolas Maduro and is demanding a recount. (AP Photo/Fernando Llano)
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