It’s been 18 years since nearly 3,000 people were killed when terrorists crashed hijacked planes into the World Trade Center, the Pentagon and a field near Shanksville, Pennsylvania.
Victims’ names are read aloud at the ground zero ceremony, where moments of silence and tolling bells mark the moments when the aircraft crashed and the trade center’s twin towers fell on Sept. 11. 2001.
Watch the video of the ceremonies.
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