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TEHRAN — Britain has warned of “serious consequences” after angry mobs stormed the UK embassy compound in Tehran.

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The U.N. Security Council condemned the attacks “in the strongest terms”. U.S. President Barack Obama said he was disturbed by the incident and called on Iran to hold those responsible to task.

The attacks come at a time of rising diplomatic tension between Iran and Western nations who last week imposed fresh sanctions over Tehran’s nuclear programme, which they believe is aimed at achieving the capability of making an atomic bomb.

Iran has expelled the British ambassador to Tehran in retaliation for the sanctions, which have also been enforced by the United States and Canada

Iran, the world’s fifth biggest oil exporter, says it only wants nuclear plants to generate electricity.

A large group of protesters broke away from a crowd of a few hundred people outside the main embassy compound in downtown Tehran, scaled the embassy gates and went inside as Iranian security forces stood by.