Members of Mara Salvatrucha (MS13) are pictured in the Criminal Center of Ciudad Barrios, on March 4, 2013

Members of Mara Salvatrucha (MS13) are pictured in the Criminal Center of Ciudad Barrios, San Miguel, 160 km east of San Salvador on March 4, 2013. Rival Salvadoran street gangs on Saturday added a sixth city to a truce signed a year ago, in a hopeful sign for a peace pact that has dramatically lowered deaths from gang-related homicide.