Opposition demonstrators take part in a protest against the government of Venezuelan President Nicolas Maduro in Caracas on March 4, 2014. Thousands of flag-waving protesters took to the streets in Venezuela Tuesday to keep the pressure on the government on the eve of the anniversary of the death of late Venezuelan President Hugo Chavez. At least 18 people have been killed and 250 were injured since a wave of protests began on February 4. AFP PHOTO /JUAN BARRETO (Photo credit should read JUAN BARRETO/AFP/Getty Images)