America marks the 17th anniversary of the Sept. 11 terrorist attacks

Remembrance ceremonies were held around the nation Tuesday to honor the nearly 3,000 people who died 17 years ago in the 9/11 terrorist attacks.

New York

People walk under an American flag inside the Oculus, part of the World Trade Center Transportation Hub in New York, on the anniversary of the 9/11 terrorist attacks.

A man looks at the north reflecting pool, which sits in the footprint where the north tower of the World Trade Center once stood.

People walk through the Oculus at the former World Trade Center site on the 17th anniversary of the Sept. 11 terrorist attacks.

Malibu

Pepperdine University’s “Waves of Flags” display in Alumni Park in Malibu features 2,977 flags: 2,887 American flags for each American life lost and 90 international flags representing the home countries of individuals from abroad who were killed in the terrorist attacks.

Los Angeles

With tears in her eyes, Los Angeles Police Sergeant Heidi Stoecklein touches the 23-ton, 22-foot tall memorial steel column that was originally part of the World Trade Center, remembering the 343 firefighters who died in the towers at the annual Los Angeles Fire Department 9/11 Remembrance Ceremony at the Hotchkins Memorial Training Center.

LA County Sheriff Jim McDonald, left and Los Angeles County Fire Chief Daryl L. Osby, perform "The Ringing of the Bell" ceremony at the annual Los Angeles Fire Department 9/11 Remembrance Ceremony at the Hotchkins Memorial Training Center.

Arlington, Va.

An American flag is unfurled at sunrise at the Pentagon. Seventeen years ago, 184 were killed when Flight 77 crashed into the building.

Shanksville, Pa.

Visitors to the Flight 93 National Memorial hold a giant flag during a moment of remembrance. United Airlines Flight 93 crashed into a field outside Shanksville, Pa., as passengers and crew tried to retake control from the terrorists.

People look on during the anniversary commemoration at the Flight 93 National Memorial in Pennsylvania.