Police stand guard after a successful operation to rescue four hostages during a prison riot at the Centro Correccional Etapa II reformatory in San Jose Pinula, Guatemala, Monday, March 20, 2017. Using tear gas and guns, police entered the jail and freed four jail guards, following a riot that broke out Sunday during which two jail monitors were killed, according Interior Minister Francisco Rivas. (AP/RSS Photo/Moises Castillo)