Masked anti-government demonstrators walk amid teargas fired by Bolivarian National Police during a protest to demand the release of arrested student protesters in Caracas, Venezuela, Monday, May 12, 2014. Venezuelan courts have ordered 11 student protesters to stand trial, but they have freed more than 150 others arrested with them during raids on encampments set up by protesters opposed to President Nicolas Maduro's government. (AP Photo/Fernando Llano)