NO Access Israel Media/Persian Language TV Stations Outside Iran/Strictly No Access BBC Persian/VOA Persian/Manoto-1 TV/Iran International

Thousands of people were filmed on Tehran's streets on Monday, just a few hours ahead of a ceremony marking the 40th anniversary of the US Embassy takeover.

The incident, known as the 'Iran hostage crisis', started after hundreds of Iranian students, who supported the Iranian Revolution, took over the US Embassy in Tehran on November 4, 1979. Fifty-two US diplomats and citizens were held hostage for 444 days inside the embassy premises.

It was widely seen in Iran as a blow against the US, its influence in Iran, and its perceived attempts to undermine the Iranian Revolution.

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