An inmate belonging to the Mara Salvatrucha, or MS-13, gang stands inside a prison in Ciudad Barrios, El Salvador, on March 26, 2012. (Associated Press) ** FILE **

Photo by: Luis Romero

An inmate belonging to the Mara Salvatrucha, or MS-13, gang stands inside a prison in Ciudad Barrios, El Salvador, on March 26, 2012. (Associated Press) ** FILE **