He also observed a moment of silence at the White House before laying a wreath and delivering remarks at the Pentagon, where 184 people died.
Pence told the crowd he was in Washington as a member of Congress on 9/11. He says that was the longest 12 minutes of his life, but he soon learned the plane went down in a field in Shanksville, Pa.
Nineteen al Qaeda members hijack four USA passenger airliners.
As bad as that day truly was, it could have been markedly worse if it wasn't for the fearless and selfless individuals aboard Flight 93 who, together, overtook the hijackers and crashed the plane into an empty field in Shanksville, Pa. Some name-readers added messages ranging from the universal to the personal - updates on family graduations and marriages, memories of personality traits and favorite foods.
U.S. Secretary of the Interior Ryan Zinke also will speak at the ceremony.
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Did it? I think he (Oxlade-Chamberlain) was not worse than any other player on the football pitch. It was a unusual last few days of the transfer window for Arsenal .
The National September 11 Memorial & Museum in New York City will hold a memorial ceremony Monday morning celebrating the lives of those lost on that day, and the lives lost in the bombing of the Twin Towers on February 23, 1993.
The 93 foot tower is expected to be complete in September 2018.
Adderly and his wife, Shirley, were among the family and friends of the victims present for Sunday's tower groundbreaking.
There was a simulation of the music the tower will make when the wind blows through the fields. She loved to sing.
Actual construction on the tower will begin later this month. Twice to mark the times each plane hit the towers, twice for the moments when they fell and two more times to mark the attacks on the Pentagon and Flight 93.