21 years of 9/11 attacks: Wrenching to remember, impossible to forget - collapse of the World Trade Center

21 years of 9/11 attacks: On September 11, 2001, nearly 3,000 people were killed as 19 al-Qaida hijackers seized control of four jetliners, sending two of the planes into New York’s World Trade Center, one into the Pentagon and the fourth into a field in western Pennsylvania.
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