Americans are marking 24 years since the Sept. 11 attacks with solemn ceremonies, volunteer work and other tributes honoring the victims.

Many loved ones of the nearly 3,000 people killed will join dignitaries and politicians at commemorations Thursday in New York, at the Pentagon and in Shanksville, Pennsylvania.

At the Pentagon, in Virginia, the 184 service members and civilians killed when hijackers steered a jetliner into the headquarters of the U.S. military will be honored. President Donald Trump and first lady Melania Trump will attend the service.

Watch the ceremony from the Pentagon below.

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