Protesters in the Iranian capital, Tehran, have broken into the UK embassy compound during an anti-British demonstration, reports say.
Militant students are said to have removed the British flag, burnt it and replaced it with the Iranian flag.
They were also shown live on Iranian state TV throwing stones at embassy windows and breaking them.
The move comes after Iran resolved to reduce ties following the UK's decision to impose further sanctions on it.
The students clashed with anti-riot police and chanted "the embassy of Britain should be taken over" and "death to England", AP reports.
One protester was reported to be waving a framed picture of Queen Elizabeth II.
On Sunday, Iran's parliament voted by a large majority to downgrade diplomatic relations with the UK after the UK Treasury imposed sanctions on Iranian banks the previous week, accusing them of facilitating the country's nuclear programme.
Iran says its nuclear programme is for peaceful purposes only
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