The U.S. marks 21st anniversary of 9/11 terror attacks- Check out the entire story.

21 years after the deadliest terrorist attack on U.S. soil, Americans commemorated 9/11 with tearful condolences and "never forget" on Sunday.

"It's been 21 years, but for us, it's not 21 years. It feels like yesterday," Mantis said. "The wound is still fresh."

Mr. Biden additionally referred to the significance of American democracy, pronouncing the American human beings have a duty to shield and guard it.

First Lady Jill Biden was also scheduled to speak in Shanksville, Pennsylvania.

More than 70 of Sekou Siby's co-workers perished at Windows on the World, the restaurant atop the trade center's north tower.

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