File - Protestors hold banners showing portraits of three of the thirteen killed on Bloody Sunday, against a backdrop of a security tower in this Sunday, Feb. 1, 1998 file photo, in Londonderry, Northern Ireland. The rally was held to honor the Irish demonstrators killed during a civil rights march in 1972. Chief Constable Matt Baggott told Northern Ireland’s policing board Thursday July 5 2012 that his force is planning a Bloody Sunday investigation that would require 30 detectives and take four years. Northern Ireland’s police commander says his detectives will eventually investigate the Bloody Sunday massacre to determine whether any British soldiers should be charged with murder _ but not yet. Families of the 13 people killed when troops opened fire on Irish Catholic demonstrators in 1972 have waited for a criminal investigation to start since 2010, when the biggest fact-finding probe in British history determined that the soldiers targeted unarmed civilians. (AP Photo/Paul McErlane, File)