Brazil's President Michel Temer has ordered that the military take over security issues in Rio de Janeiro. Leo Correa/AP hide caption

A crowd waits to cross the border into Colombia over the Simón Bolívar bridge in San Antonio del Táchira, Venezuela, in July 2016. Ariana Cubillos/AP hide caption

Venezuelan President Nicolas Maduro addresses a news conference at the Miraflores Presidential Palace in Caracas last week. Federico Parra/AFP/Getty Images hide caption

Entrance to Camps 5 and 6, Naval Station Guantánamo Bay. (Photo reviewed and cleared by U.S. military.) David Welna/NPR hide caption

View of the entrance of the Oxfam offices in the commune of Petion Ville, in Port-au-Prince, last week. The British charity has come under sharp criticism for its handling of misconduct allegations against staff members accused of using prostitutes in Haiti following a devastating 2010 earthquake. Hector Retamal/AFP/Getty Images hide caption

Students sit in an open area after their school was evacuated in Veracruz, Mexico, on Friday, after a magnitude 7.2 earthquake. Later Friday, 13 people died after a helicopter surveying the damage near the epicenter crashed. Felix Marquez/AP hide caption

Revelers celebrate during the Carnival street parade of the Bloco das Carmelitas in the Santa Teresa neighborhood in Rio de Janeiro, Brazil, last week. Mauro Pimentel/AFP/Getty Images hide caption

Master guitar maker Arnulfo Rubio Orozco holds up his latest project. It's taken him a month to craft this guitar with pearl accents and wood from southern Mexico. Carrie Kahn/NPR hide caption

Oxfam International Executive Director Winnie Byanyima speaks at a forum at the World Bank Spring Meetings in 2016. Mandel Ngan/AFP/Getty Images hide caption

An Oxfam sign outside one of its charity shops in central London, where they sell secondhand goods to raise funds. Alberto Pezzali/NurPhoto via Getty Images hide caption