WATCH LIVE: Jill Biden attends 9/11 Pentagon Memorial to mark 22nd anniversary of attacks

First lady Jill Biden will participate in a wreath-laying ceremony at the National 9/11 Pentagon Memorial in Arlington, Virginia.

It has been 22 years since American Airlines Flight 77, one of four planes hijacked by al Qaeda in the 9/11 attacks, was hijacked and crashed into the southwest corner of the Pentagon, killing all 64 passengers and 125 people in the building.

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Defense Secretary Lloyd Austin and Chairman of the Joint Chiefs of Staff Gen. Mark Milley also laid a wreath at the Pentagon Memorial in the morning.

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The first lady is expected to appear around 4:20 p.m. on Monday.

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