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The Islamic Republic emblem was removed from its flag in social media posts by the US team.
The US removed the Allah symbol from graphics on social media before the World Cup meeting.
The US decided against using Iran's official flag to show support for the women in Iran who are fighting for their rights.
The death in custody of a woman who was accused of violating the strict rules around head coverings sparked the protests in Iran.
The Allah symbol was removed from the Iranian flag by the US football federation.
The Iran Football Federation sent an email to the world governing body of football, asking for a warning.
The US Soccer spokesman said that the posts had been removed and replaced with ones with the correct Iran flag.
Iran accused the US and other foreign adversaries of inciting the protests and the US government imposed sanctions on Iranian officials.
The US and Iran severed diplomatic relations.
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