What we know about Sept. 11 remembrance events:

Thursday marks 24 years since Sept. 11, 2001, when 2,977 people were killed in terrorist attacks on New York's World Trade Center, the Pentagon and a plane that crashed in Shanksville, Pennsylvania.

President Trump is attending the ceremony at the Pentagon.

In New York, there will be an annual reading of the names at Ground Zero , where the World Trade Center's Twin Towers collapsed. More than 2,700 of those killed on Sept. 11 died in that attack.

Vice President JD Vance canceled his planned trip to New York, a source said, to instead go to Utah, where conservative activist Charlie Kirk was shot and killed on Wednesday.

There will also be a ceremony in Shanksville, Pennsylvania, where Flight 93 crashed after passengers storm

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