republican debate and the site of the 2012 gop national convention. captions by vitac www.vitac.com americans mark a somber anniversary. ceremonies are taking place across the country on this tenth anniversary of the 9/11 attacks. the worst terror strikes ever on u.s. soil. in new york, events were centered at the new 9/11 memorial at ground zero. o say, can you see by the dawn s early light the names of the people who died in the world trade center attacks were read and moments of silence were held at the exact times the towers were hit and again when they fell. family members gathered at the memorial stone walls to touch the names of their loved ones. president barack obama and former president george w. bush helped lead the commemoration there. in arlington, virginia, u.s. troops placed wreaths at the memorial for 9/11 victims at the pentagon. the 184 people killed when the hijacked american airlines jetliner struck the building are all in that memorial. wh