French riot police with up with tear gas launchers, shields and batons to stop anti-NATO protesters from going downtown Strasbourg, are pictured April 4, 2009. The North Atlantic Treaty Organisation (NATO) military alliance is celebrating its 60th anniversary this week at a summit co-hosted by Germany and France. REUTERS/Wolfgang Rattay (FRANCE) ++ EDITORS NOTE THAT FRENCH LAW REQUIRES THAT FACES OF LAW ENFORCEMENT OFFICERS ARE MASKED IN PUBLICATIONS WITHIN FRANCE ++ (POLITICS MILITARY)