Protesters and police were filmed clashing this afternoon as eggs and red paint were thrown at the Iranian embassy.
Dozens of Free Iran supporters climbed over barriers in an attempt to enter the grounds of the embassy near Hyde Park, Westminster.
Footage posted to social media shows police officers holding up batons and screaming to "get back" as the crowd surges forward.
Another clip appears to show a man being handcuffed while held to the ground by officers.
The force has not yet confirmed whether any arrests have been made during the protest.
Mass unrest has erupted across Iran this week following the death of 22-year-old Mahsa Amini in police custody after she was detained for allegedly failing to adhere to the country's strict hijab rules.
Police claim she had a heart attack at the station and went into a coma, dying two days later on September 16.
Witnesses say she was severely beaten by police, with leaked medical scans suggesting that led to her death.
Protestors in Iran have been sharing videos of them waving and burning headscarves shouting "death to the dictator".
Iran's vicious Revolutionary Guard have cracked down on them brutally, with 26 dead according to local media.
Under Iran's Islamic Sharia law, imposed after the 1979 revolution, women are obliged to cover their hair and wear long, loose-fitting clothes to disguise their figures. Violators face public rebuke, fines or arrest.
But decades after the revolution, clerical rulers still struggle to enforce the law, with many women of all ages and backgrounds wearing tight-fitting, thigh-length coats and brightly coloured scarves pushed back to expose plenty of hair.
Critics and activists see the establishment's stepped-up efforts to enforce hijab compliance as part of a wider clamp-down on dissent amid deepening resentment over economic hardship at home and growing Western pressure on Iran over its disputed nuclear programme.
In a display of civil disobedience, the hashtag #No2Hijab has been widely distributed on social media for days by Iranians outside and inside the country.
Videos of women removing their hijab as they walk in the streets or resisting the morality police have flooded social media. Reuters could not verify the authenticity of the videos.
"I should have the right to decide what I want to wear and not be imprisoned because of my choice. #No2Hijab," tweeted a female user.
Waves of the hijab protests have hit the clerical establishment in the past years. In 2014, rights activist Masih Alinejad started a Facebook campaign "My Stealthy Freedom", where she shared pictures of unveiled Iranian women sent to her.
It was followed by a campaign in 2017 for women to wear white headscarves on Wednesdays and the hijab protests in 2018 when women took to the streets holding their veils aloft.
Dozens of women have been jailed in Iran for their activism against forced veiling, according to rights groups.
The Mirror has contacted the Met Police for comment.
