U.S. President Barack Obama (2nd L) takes a moment of silence during wreath laying ceremony at the National September 11th Memorial with New York City police officers and firefighters at the World Trade Center site in New York, May 5, 2011. Days after the killing of Osama bin Laden, U.S. President Barack Obama met New York firefighters on Thursday before a visit to Ground Zero to offer comfort to a city still scarred by the Sept. 11 attacks. REUTERS/Gary Hershorn (UNITED STATES – Tags: POLITICS)