Venezuelan students protest

  • An opposition demonstrator shouts for the National Bolivarian Police (BNP) to not fire tear gas at them as a member of the force, right, gestures after his superior ordered them to hold their fire, during clashes in Caracas, Venezuela, Saturday, Feb. 15, 2014. Venezuelan security forces backed by water tanks and tear gas are dispersing groups of anti-government demonstrators who tried to block Caracas' main highway Saturday evening. FERNANDO LLANO / AP

  • A demonstrator injured by rubber bullets fired by the National Bolivarian Police(BNP) is aided by paramedics after an an opposition protest ended in clashes in Caracas, Venezuela, Saturday, Feb. 15, 2014. Venezuelan security forces backed by water tanks, tear gas and rubber bullets dispersed groups of anti-government demonstrators who tried to block Caracas' main highway Saturday evening. FERNANDO LLANO / AP

  • A demonstrator throws back a tear gas canister fired by the National Bolivarian Police(BNP) in Caracas, Venezuela, Saturday, Feb. 15, 2014. Venezuelan security forces backed by water tanks and tear gas dispersed groups of anti-government demonstrators who tried to block Caracas' main highway Saturday evening. FERNANDO LLANO / AP

  • Riot policemen take their positions during clashes with anti-government students holding a protest in Caracas on February 15, 2014. Supporters and opponents of Venezuela's leftist government staged dueling rallies in Caracas and other cities in the latest public displays of discontent at soaring inflation and basic goods shortages. JUAN BARRETO / AFP/GETTY IMAGES

  • Bolivarian National Police fire tear gas toward opposition demonstrators in Caracas, Venezuela, Saturday, Feb. 15, 2014. Venezuelan security forces backed by water tanks and tear gas dispersed groups of anti-government demonstrators who tried to block Caracas' main highway Saturday evening. ALEJANDRO CEGARRA / AP

  • A masked demonstrator helps a woman affected by tear gas fired by the Bolivarian National Police in Caracas, Venezuela, Saturday, Feb. 15, 2014. Venezuelan security forces backed by water tanks and tear gas dispersed groups of anti-government demonstrators who tried to block Caracas' main highway Saturday evening. FERNANDO LLANO / AP

  • A demonstrator affected by tear gas, fired by the Bolivarian National Police, is helped after an opposition protest ended in clashes in Caracas, Venezuela, Saturday, Feb. 15, 2014. Venezuelan security forces backed by water tanks, tear gas and rubber bullets dispersed groups of anti-government demonstrators who tried to block Caracas' main highway Saturday evening. FERNANDO LLANO / AP

  • A member of the National Police shoots against opposition students in Caracas on February 15, 2014. Opposition and pro-government demonstrators were gathered at noon on Saturday in different places of Caracas and other Venezuelan localities in the fourth consecutive day of protests that have already left three dead. LEO RAMIREZ / AFP/GETTY IMAGES

  • A member of the National Police shoots against opposition students in Caracas on February 15, 2014. Supporters and opponents of Venezuela's leftist government staged dueling rallies in Caracas and other cities in the latest public displays of discontent at soaring inflation and basic goods shortages. LEO RAMIREZ / AFP/GETTY IMAGES

  • A member of the National Police shoots against anti-government students holding a protest, in Caracas on February 15, 2014. Supporters and opponents of Venezuela's leftist government staged dueling rallies in Caracas and other cities in the latest public displays of discontent at soaring inflation and basic goods shortages. LEO RAMIREZ / AFP/GETTY IMAGES

  • A member of the National Police struggles with an anti-government student taking part in a protest, in Caracas on February 15, 2014. Supporters and opponents of Venezuela's leftist government staged dueling rallies in Caracas and other cities in the latest public displays of discontent at soaring inflation and basic goods shortages. LEO RAMIREZ / AFP/GETTY IMAGES

  • A riot policeman shoots tear gas during clashes with anti-government students holding a protest, in Caracas on February 15, 2014. Supporters and opponents of Venezuela's leftist government staged dueling rallies in Caracas and other cities in the latest public displays of discontent at soaring inflation and basic goods shortages. JUAN BARRETO / AFP/GETTY IMAGES

  • Anti-government students attack a water cannon during a protest, in Caracas on February 15, 2014. Supporters and opponents of Venezuela's leftist government staged dueling rallies in Caracas and other cities in the latest public displays of discontent at soaring inflation and basic goods shortages. JUAN BARRETO / AFP/GETTY IMAGES

  • A riot policeman shoots tear gas during clashes with anti-government students holding a protest, in Caracas on February 15, 2014. Supporters and opponents of Venezuela's leftist government staged dueling rallies in Caracas and other cities in the latest public displays of discontent at soaring inflation and basic goods shortages. LEO RAMIREZ / AFP/GETTY IMAGES

  • A riot policeman walks amidst tear gas during clashes with anti-government students holding a protest, in Caracas on February 15, 2014. Supporters and opponents of Venezuela's leftist government staged dueling rallies in Caracas and other cities in the latest public displays of discontent at soaring inflation and basic goods shortages. LEO RAMIREZ / AFP/GETTY IMAGES

  • A civilian runs away from clashes between riot police and anti-government students holding a protest, in Caracas on February 15, 2014. Supporters and opponents of Venezuela's leftist government staged dueling rallies in Caracas and other cities in the latest public displays of discontent at soaring inflation and basic goods shortages. LEO RAMIREZ / AFP/GETTY IMAGES

  • Anti-government students throw stones to riot police during a protest, in Caracas on February 15, 2014. Supporters and opponents of Venezuela's leftist government staged dueling rallies in Caracas and other cities in the latest public displays of discontent at soaring inflation and basic goods shortages. JUAN BARRETO / AFP/GETTY IMAGES

  • A student demonstrates against the government of Venezuelan President Nicolas Maduro in Caracas on February 13, 2014. Students opposed to the Venezuelan government started gathering Friday for a march challenging President Nicolas Maduro, two days after another protest erupted in deadly violence. JUAN BARRETO / AFP/GETTY IMAGES

  • Thousand of anti-government students lie on the ground during a protest in front of the Venezuelan Judiciary building in Caracas on February 15, 2014. Opposition and pro-government demonstrators were gathered at noon on Saturday in different places of Caracas and other Venezuelan localities in the fourth consecutive day of protests that have already left three dead. LEO RAMIREZ / AFP/GETTY IMAGES

  • Anti-government students shout slogans during a protest in Caracas on February 15, 2014. Supporters and opponents of Venezuela's leftist government staged dueling rallies in Caracas and other cities in the latest public displays of discontent at soaring inflation and basic goods shortages. LEO RAMIREZ / AFP/GETTY IMAGES

  • Relatives, friends and pro-government supporters carry the coffin of Juan Montoya, known as "Juancho" who was one of the three killed during the recent protest in Caracas, on February 13, 2014. Venezuela's government on Thursday called for its supporters to rally against what it called fascism, a day after three people died and dozens were injured in violence at anti-government protests. Thousands demonstrated on Wednesday against rampant crime, inflation and shortages of basic goods in the biggest challenge to President Nicolas Maduro since he took over from the late Hugo Chavez last year. The protests ended with three people shot to death -- a pro-government demonstrator and two student opposition protesters. LEO RAMIREZ / AFP/GETTY IMAGES

  • Students demonstrate against the government of Venezuelan President Nicolas Maduro in Caracas on February 13, 2014. Students opposed to the Venezuelan government started gathering Friday for a march challenging President Nicolas Maduro, two days after another protest erupted in deadly violence. JUAN BARRETO / AFP/GETTY IMAGES

  • Opposition activists stop a lorry during a march in Caracas on February 15, 2014. Venezuela braced Saturday for dueling protests -- pro- and anti-government -- a day after police used tear gas to disperse students leading the biggest challenge yet to President Nicolas Maduro. JUAN BARRETO / AFP/GETTY IMAGES

  • Students demonstrate against the government of Venezuelan President Nicolas Maduro in Caracas on February 13, 2014. Students opposed to the Venezuelan government started gathering Friday for a march challenging President Nicolas Maduro, two days after another protest erupted in deadly violence. JUAN BARRETO / AFP/GETTY IMAGES

  • Thousand of anti-government students lie on the ground during a protest in front of the Venezuelan Judiciary building in Caracas on February 15, 2014. Opposition and pro-government demonstrators were gathered at noon on Saturday in different places of Caracas and other Venezuelan localities in the fourth consecutive day of protests that have already left three dead. LEO RAMIREZ / AFP/GETTY IMAGES

  • Students clash with the riot police as they protest against the government of Venezuelan President Nicolas Maduro, in Caracas on February 14, 2014. Students opposed to Venezuela's government returned to the streets on Friday to protest against Maduro after a week of violence that saw three people killed at political rallies. The tension that surrounds the demonstrations in Caracas was underscored by a report from Twitter that the government has blocked pictures of the unrest from being shared between users on the social messaging service. JUAN BARRETO / AFP/GETTY IMAGES