It was a fitting tribute to salute their fallen colleagues, as 343 flags were carried by an honour guard for each one of the firemen who died on 9/11. Firemen from across the U.S. gathered in Manhattan, New York, around St Patrick's Cathedral, as a memorial service was held after an honour guard had marched down Fifth Avenue. The largest fire department in the U.S. held the ceremony as part of a weekend of events commemorating the 10th anniversary of the 9/11 terror attacks that devastated America in 2001.