A jet airliner is lined up on Two World Trade Center tower in New York on Tuesday. In the most devastating terrorist onslaughts ever waged against the United States, knife-wielding hijackers crashed two airliners into the World Trade Center, toppling its twin 110-story towers. -> The World Trade Center tower burns behind the Brooklyn Bridge on Tuesday. A person falls headfirst after jumping from the north tower of the World Trade Center. It was a horrific sight that was repeated in the moments after the planes struck the towers. The south tower of The World Trade Center came crashing down on Tuesday after terrorists sent two airliners into the twin towers. A group of firefighters walk amid rubble near the base of the destroyed Two World Trade Center. Firefighters peering at the ash and rubble after the collapse of the World Trade Centers. Many emergency vehicles were destroyed as well. A man stands in the rubble, and calls out asking if anyone needs help, after the collapse of the first World Trade Center Tower. The streets in lower Manhattan were covered with ash and fragments from office workers' desks. A street near the World Trade Center was covered in ashes on Tuesday morning.