The 12th anniversary of the Sept. 11, 2001, terrorist attacks will be marked with two ceremonies at the Pentagon Wednesday.

President Obama is scheduled to attend a private ceremony at the Pentagon Memorial with family members of those killed in the attack.

The private ceremony, which is to include a wreath-laying and a moment of silence, is to begin at approximately 9:30 a.m., shortly before the time 12 years ago when a hijacked American Airlines jet was flown into the Pentagon, killing 125 people in the building and 59 passengers on the plane.

Obama is to speak at the ceremony, along with Defense Secretary Chuck Hagel and Chairman of the Joint Chiefs Gen. Martin E. Dempsey.

Hagel and Dempsey will speak at a second ceremony for building employees at 1 p.m. in the Pentagon’s center courtyard.

The second ceremony “is an opportunity for the Pentagon community to come together,” the Defense Department said in a statement.

The 9/11 anniversary is also being marked with ceremonies in New York City at the World Trade Center site and at the Flight 93 National Memorial in Shanksville, Pa., where Interior Secretary Sally Jewell broke ground Tuesday on a planned National Park Service visitors center.