September 9, 2001, has been embedded into people’s minds, but for all the wrong reasons. Some people have memories attached to it while some can straight away visualize the sequence of the tragedy. Two enormous planes crashing into one of the most recognizable pairs of towers in the country, the scenario was filled with agony. So much so, even after 20 years, people who were involved and witnessed have not been able to get over the trauma that ensued. On the 20th anniversary of the incident, people from all around the world are sharing condolences and warmth on social media. Here are 10 photos from the incident that changed the history of the modern world:

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