World Commemorates 9/11 Attacks Anniversary 'That Changed Our Lives Forever'

Today, the international community commemorates the 15th anniversary of the 9/11 terrorist attacks, one of the most tragic events in the US history.

On Sunday, the US paid tribute to the tragedy that shook the entire world. The names of the victims killed in the terrorist attack on September 11, 2001 were once again recited by their family members at the memorial complex built on the site of the tragedy in New York City.

During the ceremony there were six minutes of silence: four of them took place at the exact time when four planes hijacked by al-Qaeda terrorists crashed into the World Trade Center, the Pentagon and a Pennsylvania field. The other two were supposed to mark the time when both towers of the Trade Center collapsed.

"This weekend, we honor their [9/11 victims] memory once more. We stand with the survivors who still bear the scars of that day. We thank the first responders who risked everything to save others. And we salute a generation of Americans — our men and women in uniform, diplomats and our intelligence, homeland security and law enforcement professionals — who serve, and have given their lives, to help keep us safe," US President Barack Obama earlier said in his weekly address.

Today, many people worldwide expressed their condolences to the families of the victims and their beloved ones. Social network users made numerous posts on their Twitter and Facebook accounts commemorating those who were killed during the attack.

Danny Lewin bravely tackled the terrorists aboard American Airlines flight 11 on #September11, 2001. pic.twitter.com/Rwtm5V8fxt

— Gabriel Rosenberg (@GabRosenberg) 11 сентября 2016 г.

A piece of AA 77 from the #September11 terrorist attack on the Pentagon. A constant reminder in my office. pic.twitter.com/hjfeJTxFNT

— Donald Rumsfeld (@RumsfeldOffice) 11 сентября 2016 г.

A day that changed our lives forever! #NeverForget pic.twitter.com/3ByO1BpGld

— Siva Kaneswaran (@SivaKaneswaran) 11 сентября 2016 г.

Gone but never forgotten. We miss you Craig. #911 #September11 #PatriotDay pic.twitter.com/1PnyOqsWSm

— Melanie Hooyenga (@MelanieHoo) 11 сентября 2016 г.

I post this every year. RIP 👼🏼 #NeverForget #September11 pic.twitter.com/T62MfBDhRu

— lizshone (@elizabethshone) 11 сентября 2016 г.

#September11, we were all Americans, and we still are. Solidarity with the victims; 15 years after we remember. pic.twitter.com/49lGPaxT7g

— Juliette Méadel (@juliettemeadel) 11 сентября 2016 г.

#September11 I still remember where I was that day. To all the families who have lost & the heroes we will remember. pic.twitter.com/ylpsWbbTKa

— Emma Illies (@illwah) 11 сентября 2016 г.

15 years ago today, the attack that made history, happened. Prayers to the families of innocent victims #September11 pic.twitter.com/fFjMk1nYiA

— Puvanash_ (@AWPGhostProX) 11 сентября 2016 г.

the victims will never be forgotten. Sending all my love to their families #NeverForget911 #September11 pic.twitter.com/MRtkkny0Xo

— Grasy Kardashian (@iKylieFornia) 11 сентября 2016 г.

Fifteen years ago, on September 11, 2001, al-Qaeda suicide bombers hijacked four passenger planes in the United States, sending two to New York's World Trade Center towers and the other two to the Pentagon and, presumably, the White House or the Capitol.

All the airplanes, except for the last one, reached their targets. The fourth plane crashed in a field near the town of Shanksville, Pennsylvania. The number of casualties in the terrorist attacks on September 11 amounted to 2,974.