It was a day which is impossible to forget. Nearly 3,000 people were killed and countless more injured in the terror attack that forever transformed the United States. An estimated 33,000 or more people successfully evacuated the stricken buildings. America marks the 20th anniversary of 9/11 Saturday with solemn ceremonies given added poignancy by the recent chaotic withdrawal of troops from Afghanistan and return to power of the Taliban.Twenty years ago, the 9/11 terror attacks wrought death and devastation, changing the world forever. Heart-wrenching commemorations will unfold at each of the three sites where 19 Al-Qaeda hijackers -- mostly from Saudi Arabia -- crashed packed airliners, striking the cultural, financial and political hearts of the United States and changing the world forever.The painful repercussions of the attack reached the Northeast as well.On the morning of 9/11, Jupiter Yambem of Manipur, a banquet manager was in charge of a breakfast meeting of a tech conference in one of the fallen World Trade Centres.