TOPSHOT - Students opposing Venezuelan President Nicolas Maduro wearing gas masks throw back tear gas grenades at police police during a demonstration in San Cristobal, Venezuela on April 5, 2017. 
University students and police clashed Wednesday during a protest in the Venezuelan city of San Cristobal (western border with Colombia), with a balance of at least a dozen injured. / AFP PHOTO / George Castellanos        (Photo credit should read GEORGE CASTELLANOS/AFP/Getty Images)