Former President George W. Bush placed a wreath at the Pentagon in observance of the 18th anniversary of the September 11 attacks.

He was joined by Defense Secretary Mark Esper and Donald Rumsfeld, the former defense secretary who was inside the Pentagon when American Airlines Flight 77 struck the building, killing 184 people, as part of the coordinated attack on the United States in 2001.

Americans paused Wednesday to mark the 18th anniversary of the September 11, 2001, terrorist attacks that killed nearly 3,000 people in New York, Virginia and Pennsylvania.

President Donald Trump and first lady Melania Trump walked outside the White House to observe a moment of silence at 8:46 a.m., the time when hijackers flew the first of two commercial jetliners into the World Trade Center in New York.

Later, Trump addressed a ceremony at the Pentagon for families of those killed when al-Qaida terrorists flew a hijacked plane into the building that is the headquarters of the U.S. military. Early Wednesday, ahead of the ceremony, an American flag was unfurled down the side of the Pentagon.

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