Demonstrator uses a slingshot against the National Guard during a protest against Venezuelan President Nicolas Maduro’s government in San Cristobal

A demonstrator uses a slingshot against the National Guard during a protest against Venezuelan President Nicolas Maduro’s government in San Cristobal, about 410 miles (660 km) southwest of Caracas, February 27, 2014. U.N. Secretary-General Ban Ki-moon and Pope Francis called on Wednesday for an end to violence in Venezuela that has killed at least 13 people and urged politicians to take the lead in calming the nation’s worst unrest in a decade. REUTERS/Carlos Garcia Rawlins (VENEZUELA – Tags: POLITICS CIVIL UNREST)