A quarter-century after the attacks on September 11, 2001, officials across the United States have taken part in tributes and memorials to honour the 2,977 victims and those who risked their lives as part of the rescue efforts. The incident is considered the deadliest “terrorist” attack in US history. Four planes were hijacked. Two crashed into the World Trade Center, causing its Twin Towers to collapse. A third struck the Pentagon outside Washington, DC. And the fourth plummeted into a field in Shanksville, Pennsylvania, after passengers and crew rose against their attackers.
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