Speaking on the condition of anonymity to IRNA correspondent on Saturday, a spokesperson at the UK Foreign and Commonwealth Office said that Britain takes its duty toward international conventions on diplomatic relations highly seriously.

“Ensuring the safety of diplomats and diplomatic sites in UK is of high significance to us,” the spokesperson stressed.

On Friday afternoon, four members of Sadeq Shirazi, a Britain-based Shia extremist sect, scaled the wall of Iran’s embassy building in London and took down the Iranian flag.

Following the raid, Iran’s Foreign Ministry sumoned UK Ambassador to Tehran Nicholas Hopton to express the Islamic Republic’s protest and object the performance of the UK police in the face of the attack.

Field reports of the night of the raid indicate that the British police apprehended trespassers several hours after the raid.

Chairman of Iran’s Parliament National Security and Foreign Policy Commission, Alaeddin Boroujerdi, also said that the raid could not have occurred without approval or neglect from the British security guards and police.

Nobakht was referring to the raid on Iranian embassy in London Friday afternoon, where four members of Sadeq Shirazi, a Britain-based Shia extremist sect, scaled the wall of Iran’s embassy building and took down the Iranian flag.

He condemned the attack, adding “reports so far indicate that the British police apprehended the few people trespassing on the Iranian embassy several hours after the attack. This shows that the British police have failed to observe the international law.”

Nobakht further vowed that Iran’s response to the incident will be decisive.

Meanwhile, Iranian Foreign Ministry has called for the trial and punishment of the perpetrators of the assault.

Chairman of Iran’s Parliament National Security and Foreign Policy Commission, Alaeddin Boroujerdi, said Saturday that the British government should be held accountable for the attack and any subsequent damage to the compound.