A girl holds a poster with the image of Northern Ireland police officer, Ronan Kerr, at a rally in Omagh...
A girl holds a poster with the image of Northern Ireland police officer, Ronan Kerr who was killed when a bomb exploded under his car, at a rally in Omagh, Co Tyrone April 10, 2011 REUTERS/Cathal McNaughton (Northern Ireland - Tags: CIVIL UNREST POLITICS SOCIETY)