America Marks 9/11 Anniversary

In Pennsylvania the victims were lauded as heroes. At the Pentagon, President Obama spoke of a nation that refused to "give in to fear." In New York, a somber roll call of the dead was peppered with tributes and declarations of love.

The nation on Thursday marked the 13th anniversary of the 9/11 attacks at the three sites where four hijacked planes crashed, a minutes-long wave of tragedy that killed almost 3,000 people, triggered at least two wars and rocked the entire world.

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