New York City Mayor Bill de Blasio (R) exits a cell during a tour of the Enhanced Supervision Housing Unit at the Rikers Island Correctional facility in New York March 12, 2015. New York City is proposing to reduce violence among inmates at its troubled Rikers Island jail by limiting visitors, adding security cameras and separating rival gangs, de Blasio announced on Thursday. REUTERS/Brendan McDermid (UNITED STATES - Tags: POLITICS CRIME LAW CIVIL UNREST)