Members of the Barrio 18 gang wait to be admitted upon their arrival to the San Francisco Gotera penitentiary April 21, 2015. Salvadoran goverment transfered 1,177 inmates, members of the Barrio 18 gang from Izalco jail to San Francisco Gotera in a effort to curb gang violence activity, according to local media. REUTERS/Jose Cabezas

Members of the Barrio 18 gang run upon their arrival to the San Francisco Gotera penitentiary April 21, 2015. Salvadoran goverment transfered 1,177 inmates, members of the Barrio 18 gang from Izalco jail to San Francisco Gotera in a effort to curb gang violence activity, according to local media. REUTERS/Jose Cabezas

A member of the Barrio 18 gang waits to be admitted upon their arrival to the San Francisco Gotera penitentiary April 21, 2015. Salvadoran goverment transfered 1,177 inmates, members of the Barrio 18 gang from Izalco jail to San francisco Gotera in a effort to curb gang violence activity, according to local media. REUTERS/Jose Cabezas TPX IMAGES OF THE DAY

Salvadoran policeman guards members of the Barrio 18 gang upon their arrival to the San Francisco Gotera penitentiary April 21, 2015. Salvadoran goverment transfered 1,177 inmates, members of the Barrio 18 gang from Izalco jail to San Francisco Gotera in a effort to curb gang violence activity, according to local media. REUTERS/Jose Cabezas

Members of the Barrio 18 gang run upon their arrival to the San Francisco Gotera penitentiary April 21, 2015. Salvadoran goverment transfered 1,177 inmates, members of the Barrio 18 gang from Izalco jail to San Francisco Gotera in a effort to curb gang violence activity, according to local media. REUTERS/Jose Cabezas

Members of the Barrio 18 gang wait to be admited on their arrival to the San Francisco Gotera penitentiary April 21, 2015. Salvadoran goverment transfered 1,177 inmates, members of the Barrio 18 gang from Izalco jail to San francisco Gotera in a effort to curb gang violence activity, according to local media. REUTERS/Jose Cabezas TPX IMAGES OF THE DAY

Members of the Barrio 18 gang wait to be admitted upon their arrival to the San Francisco Gotera penitentiary April 21, 2015. Salvadoran goverment transfered 1,177 inmates, members of the Barrio 18 gang from Izalco jail to San Francisco Gotera in a effort to curb gang violence activity, according to local media. REUTERS/Jose Cabezas

Members of the Barrio 18 gang get off a bus upon their arrival to the San Francisco Gotera penitentiary April 21, 2015. Salvadoran goverment transfered 1,177 inmates, members of the Barrio 18 gang from Izalco jail to San Francisco Gotera in a effort to curb gang violence activity, according to local media. REUTERS/Jose Cabezas

Members of the Barrio 18 gang wait to be admitted upon their arrival to the San Francisco Gotera penitentiary April 21, 2015. Salvadoran goverment transfered 1,177 inmates, members of the Barrio 18 gang from Izalco jail to San Francisco Gotera in a effort to curb gang violence activity, according to local media. REUTERS/Jose Cabezas

Members of the Barrio 18 gang run upon their arrival to the San Francisco Gotera penitentiary April 21, 2015. Salvadoran goverment transfered 1,177 inmates, members of the Barrio 18 gang from Izalco jail to San Francisco Gotera in a effort to curb gang violence activity, according to local media. REUTERS/Jose Cabezas

Members of the Barrio 18 gang run upon their arrival to the San Francisco Gotera penitentiary April 21, 2015. The Salvadoran goverment transfered 1,177 inmates, members of the Barrio 18 gang from Izalco jail to San francisco Gotera in a effort to curb gang violence activity, according to local media. REUTERS/Jose Cabezas TPX IMAGES OF THE DAY

Members of the Barrio 18 gang run upon their arrival to the San Francisco Gotera penitentiary April 21, 2015. Salvadoran goverment transfered 1,177 inmates, members of the Barrio 18 gang from Izalco jail to San Francisco Gotera in a effort to curb gang violence activity, according to local media. REUTERS/Jose Cabezas

Members of the Barrio 18 gang run upon their arrival to the San Francisco Gotera penitentiary April 21, 2015. Salvadoran goverment transfered 1,177 inmates, members of the Barrio 18 gang from Izalco jail to San Francisco Gotera in a effort to curb gang violence activity, according to local media. REUTERS/Jose Cabezas

Members of the Barrio 18 gang wait to be admited on their arrival to the San Francisco Gotera penitentiary April 21, 2015. Salvadoran goverment transfered 1,177 inmates, members of the Barrio 18 gang from Izalco jail to San Francisco Gotera in a effort to curb gang violence activity, according to local media. REUTERS/Jose Cabezas

Members of the Barrio 18 gang run upon their arrival to the San Francisco Gotera penitentiary April 21, 2015. Salvadoran goverment transfered 1,177 inmates, members of the Barrio 18 gang from Izalco jail to San Francisco Gotera in a effort to curb gang violence activity, according to local media. REUTERS/Jose Cabezas

Members of the Barrio 18 gang run upon their arrival to the San Francisco Gotera penitentiary April 21, 2015. Salvadoran goverment transfered 1,177 inmates, members of the Barrio 18 gang from Izalco jail to San Francisco Gotera in a effort to curb gang violence activity, according to local media. REUTERS/Jose Cabezas