The Phoenix Police and Fire Honor Guard stood at attention for the duration of the memorial ceremony. Nearly 3,000 people died Sept. 11, 2001, when a group of terrorists hijacked four commercial jetliners – flying two into the World Trade Center and one into the Pentagon; passengers on the fourth jet overpowered the hijackers before it crashed near Shanksville, Pennsylvania. (Photo by Rio Paynter/Cronkite News)

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