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The US men's football team has begun displaying Iran's national flag on social media without the emblem of the Islamic Republic as nationwide protests challenging Tehran's theocratic government continue.

The Twitter account of the US men's team on Sunday displayed a banner with the squad's matches in the group stage, with the Iranian flag only bearing its green, white and red colours.

The same could be seen in a post on its Facebook, Instagram and Twitter accounts laying out the point totals so far in its group.

All eyes on Tuesday. 🇺🇸

— U.S. Men's National Soccer Team (@USMNT)

The US men's team did not immediately respond to a request for comment.

However, the absence of the emblem comes as monthslong demonstrations have challenged Iran's government since the 16 September death of 22-year-old Kurdish Iranian Mahsa Amini, who had been detained by the country's morality police for allegedly wearing her hijab 'incorrectly'. Amini's Kurdish first name can be spelt "Zhina" or "Jina".

The protests have seen at least 450 people killed since they started, as well as over 18,000 arrested, according to Human Rights Activists in Iran, an advocacy group following the demonstrations.

Iran has not released casualty or arrest figures for months and alleges without providing evidence that the protests have been fomented by its enemies abroad, including the US.

Tehran also restricts press access and has detained over 63 reporters and photographers since the demonstrations began, according to the Committee to Protect Journalists, making covering the unrest that much more difficult.

Iran's mission to the United Nations and its football federation did not immediately respond to a request for comment.

Iranian state media had yet to acknowledge the emblem's absence on the US men's team accounts, though comments raged online.

The Islamic Republic emblem, designed in 1980, is four curves with a sword between them. It represents the Islamic saying: "There is no god but God." It also resembles a tulip or lotus.

Iran scored twice in the final moments of stoppage time after a thrilling match against Wales to keep alive their hopes of reaching the World Cup knockout stages

— °®Âþµº (@The_NewArab)

At the top and the bottom of the flag, there are 22 inscriptions of "God is Great" as well, which honours the date on the Persian calendar when the Islamic Revolution took hold.

The flag has become a point of contention at the World Cup. Apparent pro-government supporters have waved it, shouting at those demonstrating over Amini's death.

Others at matches have waved Iran's lion and sun flag, an emblem of its former ruler, the late Shah Mohammad Reza Pahlavi.

More security forces could be seen at Iran's last match against Wales. In the capital Tehran, anti-riot police – the same ones cracking down on protests – waved the Iranian flag after the Wales win, angering demonstrators.

Team Melli will face the US on Tuesday.