Americans across the country are honoring the nearly 3,000 people that died during the Sept. 11 terrorist attacks that occurred 12 years ago today.
On Sept, 11, 2001, hijacked planes crashed into the World Trade Center, the Pentagon, and a Pennsylvania field. The attacks were later claimed by bin Laden and al Qaeda, resulting in the war between the U.S. and Afghanistan.
Remembrance on the 12th anniversary of the attacks has taken many forms on Wednesday.
Somber observances in New York City included a moment of silence at 8:46 a.m. - marking the time that American Airlines Flight 11 crashed into the North Tower of the World Trade Center on this day in 2001.
Another observation of silence occurred at 9:03 a.m. Wednesday morning in honor of the time that United Airlines Flight 175 struck the South Tower.
Additional moments of silence will be observed at 9:37 a.m., when American Airlines Flight 77 struck the Pentagon; at 9:59 a.m. when the South Tower collapsed; at 10:03 a.m. when United Flight93 hit the ground near Shanksville, Penn., and at 10:28 a.m., when the North Tower fell.
Furthermore, a ceremony was held at the National September 11 Memorial plaza in New York City on Wednesday morning.
Also, in Washington, President Barack Obama is scheduled to attend a private Pentagon ceremony for family members of those killed in the attack. The ceremony will include a wreath-laying, according to Reuters.
The Flight 93 National Memorial in Pennsylvania is also held a memorial service on Wednesday to remember those who lost their lives during the attacks.
Moreover, cities across the U.S. will be holding ceremonies as well as 21-gun salutes and observing moment of silence in remembrance of September 11, 2001.
On Twitter, thousands of users are remember the attacks, and #september11, #NeverForget, #wherewereyou, and #twintowers all becoming trending topics on the social media site on Wednesday.
Among those honoring Sept. 11 victims was E! News host Giuliana Rancic who tweeted: "Praying for those whose lives were taken too soon and their families continue to hurt. #neverforget #september11"
"Let's pay tribute to those we loved and lost 12 years ago through acts of kindness and charity for others. #September11," posted "Today Show" expert Joy Bauer.