Families of loved ones have described the 'unbearable sorrow' as they remember the terrible day 20 years ago, when almost 3000 lives were lost when hijacked planes smashed into the twin towers of the World Trade Center in New York City, into the Pentagon outside Washington, and a fourth crashed into a field in Pennsylvania. 

President Joe Biden presided over a minute's silence marking the moment the first plane hit the first Tower as the names of every single one of the 2,977 people who lost their lives were read aloud.

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