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Britain's ambassador to Iran has been arrested in Tehran during protests outside a university, the UK Foreign office has said.
Dominic Raab, the foreign secretary, said the arrest of Rob Macaire was a "flagrant violation of international law''.
He was detained for more than an hour before being released, the Iranian Tasnim news agency reported.
He is said to have been one of a number of individuals held on suspicion of organising, provoking and directing radical actions.
In a statement, Mr Raab said: “The arrest of our ambassador in Tehran without grounds or explanation is a flagrant violation of international law.
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This photo released by the Iraqi Prime Minister Press Office shows a burning vehicle at the Baghdad International Airport following an airstrike in Baghdad, Iraq, early Friday 3 January
AP
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The wreckage of the car in which general Soleimani was travelling when a targeted US airstrike struck outside Baghdad International Airport on 3 January
Ahmad Al Mukhtar via Reuters
3/35
Demonstrators burn the US and British flags during a protest in Tehran after general Soleimani was killed in a targeted airstrike by American forces
Reuters
4/35
A burning vehicle at the Baghdad International Airport following an airstrike. The Pentagon said Thursday that the US military has killed general Qassem Soleimani, the head of Iran's elite Quds Force, at the direction of Donald Trump
AP
5/35
Protesters burn Israeli and US flags as thousands of Iranians take to the streets to mourn the death of general Soleimani at the hands of America
EPA
6/35
Supporters of Donald Trump pray at an 'Evangelicals for Trump' campaign event held on the day following the killing of general Soleimani. At the event, the president praised the "flawless strike that eliminated the terrorist ringleader"
AFP via Getty
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A huge procession of mourners gather in Baghdad for the funeral of general Soleimani on 4 January
AP
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Thousands of Iranians take to the streets to mourn the death of Soleimani during an anti-US demonstration to condemn the killing of Soleimani, after Friday prayers in Tehran, Iran
EPA
9/35
Iraqis perform a mourning prayer for slain major general Qasem Soleimani of the Iranian Revolutionary Guards at the Great Mosque of Kufa
AFP via Getty
10/35
A billboard reading 'Death to America and Israel', installed by Iran-backed shiite armed groups at a street in Jadriyah district in Baghdad, Iraq
EPA
11/35
A handout picture provided by the office of Iran's supreme leader Ayatollah Ali Khamenei shows him visiting the family of Soleiman
KHAMENEI.IR/AFP via Getty
12/35
Thousands of Iranians take to the streets in Tehran
EPA
13/35
Pakistani Shiite Muslims burn a mock of a US flag as they hold pictures of General Qasem Soleimani during a protest against the USA, outside the US Consulate in Lahore, Pakistan
EPA
14/35
Iran's Ambassador to Lebanon Mohammed Jalal Feiruznia, looks to a portrait of Soleimani, as he receives condolences at the Iranian embassy, in Beirut, Lebanon
AP
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People make their way on the street while a screen on the wall of a cinema shows a portrait Soleimani in Tehran
AP
16/35
Aziz Asmar, one of two Syrian painters who completed a mural following the killing of Iranian Revolutionary Guards commander Qasem Soleimani poses next to his creation in the rebel-held Syrian town of Dana in the northwestern province of Idlib
AFP via Getty
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A demonstration in Tehran
AFP via Getty
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An anti-US demonstration to condemn the killing of Soleimani, after Friday prayers in Tehran
EPA
19/35
Mujtaba al-Husseini, the representative of Iran's supreme leader Ayatollah Ali Khamenei, delivers a speech in the holy shrine city of Najaf
AFP via Getty
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Pakistani Shiite Muslims burn a mock of a US and Israeli flags as they hold pictures of General Qasem Soleimani during a protest against the USA, outside the US Consulate in Lahore, Pakistan
EPA
21/35
Protesters demonstrate in Tehran
AP
22/35
Pakistani Shi'ite Muslims hold pictures of General Qasem Soleimani during a protest against the USA, in Peshawar, Pakistan
EPA
23/35
Protesters, holding a photograph of the leader of the People's Mujahedin of Iran Massoud Rajavi, outside Downing Street in London
PA
24/35
Protesters burn a US flag in Tehran
AP
25/35
A Syrian man offers sweets to children to mark the killing
AFP via Getty
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Iranian worshippers attend a mourning prayer for Soleimani in Iran's capital Tehran
AFP via Getty
27/35
Kashmiri Shiite Muslims shout anti American and anti Israel slogans during a protest
AP
28/35
Iranian worshipers chant slogans during Friday prayers
Reuters
29/35
A protest against the USA, in Islamabad, Pakistan
EPA
30/35
Iranians burn a US flag in Tehran
EPA
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Supporters of the National Council of Resistance of Iran in Germany (NWRI) protest outside Iran's embassy in Berlin, Germany
Reuters
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Supporters of the National Council of Resistance of Iran in Germany (NWRI) protest outside Iran's embassy in Berlin
Reuters
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Iranian worshippers in Tehran
AFP via Getty
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Vehicles of the United Nations Interim Forces in Lebanon (UNIFIL) patrol a road in the southern Lebanese town of Kfar Kila near the border with Israel. Following morning's killing of Major General Qasem Soleimani, Lebanon's Iran-backed Hezbollah movement called for the missile strike by Israel's closest ally, to be avenged
AFP via Getty
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Iranian women take to the streets in Tehran
EPA
1/35
This photo released by the Iraqi Prime Minister Press Office shows a burning vehicle at the Baghdad International Airport following an airstrike in Baghdad, Iraq, early Friday 3 January
AP
2/35
The wreckage of the car in which general Soleimani was travelling when a targeted US airstrike struck outside Baghdad International Airport on 3 January
Ahmad Al Mukhtar via Reuters
3/35
Demonstrators burn the US and British flags during a protest in Tehran after general Soleimani was killed in a targeted airstrike by American forces
Reuters
4/35
A burning vehicle at the Baghdad International Airport following an airstrike. The Pentagon said Thursday that the US military has killed general Qassem Soleimani, the head of Iran's elite Quds Force, at the direction of Donald Trump
AP
5/35
Protesters burn Israeli and US flags as thousands of Iranians take to the streets to mourn the death of general Soleimani at the hands of America
EPA
6/35
Supporters of Donald Trump pray at an 'Evangelicals for Trump' campaign event held on the day following the killing of general Soleimani. At the event, the president praised the "flawless strike that eliminated the terrorist ringleader"
AFP via Getty
7/35
A huge procession of mourners gather in Baghdad for the funeral of general Soleimani on 4 January
AP
8/35
Thousands of Iranians take to the streets to mourn the death of Soleimani during an anti-US demonstration to condemn the killing of Soleimani, after Friday prayers in Tehran, Iran
EPA
9/35
Iraqis perform a mourning prayer for slain major general Qasem Soleimani of the Iranian Revolutionary Guards at the Great Mosque of Kufa
AFP via Getty
10/35
A billboard reading 'Death to America and Israel', installed by Iran-backed shiite armed groups at a street in Jadriyah district in Baghdad, Iraq
EPA
11/35
A handout picture provided by the office of Iran's supreme leader Ayatollah Ali Khamenei shows him visiting the family of Soleiman
KHAMENEI.IR/AFP via Getty
12/35
Thousands of Iranians take to the streets in Tehran
EPA
13/35
Pakistani Shiite Muslims burn a mock of a US flag as they hold pictures of General Qasem Soleimani during a protest against the USA, outside the US Consulate in Lahore, Pakistan
EPA
14/35
Iran's Ambassador to Lebanon Mohammed Jalal Feiruznia, looks to a portrait of Soleimani, as he receives condolences at the Iranian embassy, in Beirut, Lebanon
AP
15/35
People make their way on the street while a screen on the wall of a cinema shows a portrait Soleimani in Tehran
AP
16/35
Aziz Asmar, one of two Syrian painters who completed a mural following the killing of Iranian Revolutionary Guards commander Qasem Soleimani poses next to his creation in the rebel-held Syrian town of Dana in the northwestern province of Idlib
AFP via Getty
17/35
A demonstration in Tehran
AFP via Getty
18/35
An anti-US demonstration to condemn the killing of Soleimani, after Friday prayers in Tehran
EPA
19/35
Mujtaba al-Husseini, the representative of Iran's supreme leader Ayatollah Ali Khamenei, delivers a speech in the holy shrine city of Najaf
AFP via Getty
20/35
Pakistani Shiite Muslims burn a mock of a US and Israeli flags as they hold pictures of General Qasem Soleimani during a protest against the USA, outside the US Consulate in Lahore, Pakistan
EPA
21/35
Protesters demonstrate in Tehran
AP
22/35
Pakistani Shi'ite Muslims hold pictures of General Qasem Soleimani during a protest against the USA, in Peshawar, Pakistan
EPA
23/35
Protesters, holding a photograph of the leader of the People's Mujahedin of Iran Massoud Rajavi, outside Downing Street in London
PA
24/35
Protesters burn a US flag in Tehran
AP
25/35
A Syrian man offers sweets to children to mark the killing
AFP via Getty
26/35
Iranian worshippers attend a mourning prayer for Soleimani in Iran's capital Tehran
AFP via Getty
27/35
Kashmiri Shiite Muslims shout anti American and anti Israel slogans during a protest
AP
28/35
Iranian worshipers chant slogans during Friday prayers
Reuters
29/35
A protest against the USA, in Islamabad, Pakistan
EPA
30/35
Iranians burn a US flag in Tehran
EPA
31/35
Supporters of the National Council of Resistance of Iran in Germany (NWRI) protest outside Iran's embassy in Berlin, Germany
Reuters
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Supporters of the National Council of Resistance of Iran in Germany (NWRI) protest outside Iran's embassy in Berlin
Reuters
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Iranian worshippers in Tehran
AFP via Getty
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Vehicles of the United Nations Interim Forces in Lebanon (UNIFIL) patrol a road in the southern Lebanese town of Kfar Kila near the border with Israel. Following morning's killing of Major General Qasem Soleimani, Lebanon's Iran-backed Hezbollah movement called for the missile strike by Israel's closest ally, to be avenged
AFP via Getty
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Iranian women take to the streets in Tehran
EPA
"The Iranian government is at a cross-roads moment. It can continue its march towards pariah status with all the political and economic isolation that entails, or take steps to de-escalate tensions and engage in a diplomatic path forwards."
In a tweet Tasnim news – an organisation with links to Iran’s Islamic revolutionary guard, said he had been detained “for organizing suspicious movements and protests in front of Amir Kabir University but released after hours”
The tweet added he would be “summoned by the foreign ministry tomorrow morning”.
It is understood that Mr Macaire had been attending what had been billed as a vigil for the victims of the crash.
However the event quickly turned into a demonstration at which point Mr Macaire left.
It was as he was returning to the British embassy that he was arrested - although it is not clear who he was held by.
Following a number of urgent calls to the Iranian Ministry of Foreign Affairs he was eventually released and allowed to return to the embassy.
Additional reporting by Reuters.