Biden, Former Presidents, Mark 20 Years Since 9/11 Attacks.

Three presidents and their wives stood somberly side by side at the National September 11 Memorial in New York, sharing a moment of silence to mark the anniversary of the nation's worst terror attack with a display of unity.

READ MORE: President Joe Biden is commemorating the 20th anniversary of September 11, 2001, Saturday with three somber, silent events as he visits the three sites of the worst terrorist attack in modern history.

Biden, along with first lady Jill Biden, is attending ceremonies at the places where four planes and 19 hijackers started America’s 20-year involvement in Afghanistan. His first stop, in New York City, came amid beefed-up security, city and state officials said, though Mayor Bill de Blasio stressed there were “no specific and credible threats” against New York.

In prerecorded comments, Biden used the grave occasion to again call for unity in an increasingly divided America.

“Unity is what makes us who we are,” he said. “America at its best — to me, that's the central lesson of September 11th — is that, at our most vulnerable, in the push and pull of all that makes us human, in the battle for the soul of America, unity is our greatest strength. Unity doesn't mean we have to believe the same thing. We must have a fundamental respect and faith in each other and in this nation.”

LINK: www.voanews.com/usa/biden-oversees-somber-silent-911-commemoration

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LIVE - President Joe Biden Addresses the UN General Assembly.

LIVE - President Joe Biden Addresses the UN General Assembly.

US President Joe Biden speaks at the United Nations Headquarters in New York.

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