Former Pres. George W. Bush spoke to first responders atop the pile at Ground Zero three days after Sept. 11, 2001.

"I can hear you, the rest of the world hears you, and the people who knocked these buildings down will hear all of us soon," he said. Responding to the president's words, some rescue workers chanted, "USA, USA!"

This Monday marked 22 years since the attacks, during which 2,977 people lost their lives.

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