A group calling itself Saraya Awliya Al Dam has reportedly claimed responsibility for Monday night's attack on a US military base near Erbil, in the Kurdish Region of Iraq.
The attack killed a civilian contractor and injured six people, including a US serviceman.
While the claim could not immediately be verified, the past 18 months have seen the emergence of a number of new Shiite militia groups in Iraq.
These have been characterised as front organisations for official Iran-backed groups within a larger Iraqi militia organisation – the Popular Mobilisation Forces (PMF).
Kurdish intelligence services later found Iranian Fajr-1 rockets still intact at their launch site, within the Kurdish region of Iraq.
The Fajr 1 has a short range of around eight kilometres, confirming the view of security sources that the projectiles used in the Erbil attack had been launched by militia fighters within the semi-autonomous region.
The PMF is linked to the Iraqi government, but a number of hardline elements and the leadership of the organisation often follow Iranian orders.
It has sent units to fight in Syria and has attacked international coalition forces in Iraq.
A previous attack on the base near Erbil originated in the Nineveh plains, outside the northern Iraqi city of Mosul, an area under the control of Iran-backed militias.
In the hours before the Erbil attack, another group calling itself Ashab Ahl Kahf fired rockets at Turkish forces in northern Iraq, who were undertaking an offensive against the Kurdistan Workers' Party militia.
Ashab Ahl Kahf is thought to be linked to Asaib Ahl Al Haq, a hardline PMF militia with a political wing, Sadiqun, which has 15 seats in Iraq's parliament.
US Secretary of State Antony Blinken said he was "outraged" by the attack in Erbil, and pledged that the US would work with Iraqi authorities in investigations to hold those responsible to account.
However, this could be a difficult task. Even if the attacks can be traced to Iran-backed groups, hardline pro-Iranian militias enjoy a degree of protection from their allied political parties in Iraq's parliament.
Calling for an investigation is in stark contrast to what occurred following a similar incident under the administration of former president Donald Trump.
When rockets killed a US civilian contractor on December 27, 2019, the situation escalated into US airstrikes and PMF retaliation.
This culminated in the assassination of Iran's Maj Gen Qassem Suleimani, commander of the Islamic Revolutionary Guard Corps' Quds Force, and in response, an Iranian ballistic missile attack on US bases in Iraq.
War was averted when the US decided further escalation could lead to full-scale conflict.
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World record transfers
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2. Paul Pogba - to Manchester United in 2016/17 - €105m
3. Gareth Bale - to Real Madrid in 2013/14 - €101m
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6. Neymar - to Barcelona in 2013/14 - €88.2m
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8. Luis Suarez - to Barcelona in 2014/15 - €81.72m
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Director: Basel Adra, Yuval Abraham, Rachel Szor, Hamdan Ballal
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The lowdown
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Cast: Amitabh Bachchan, Taapsee Pannu, Amrita Singh, Tony Luke
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Formula One top 10 drivers' standings after Japan
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2. Sebastian Vettel, Ferrari 247
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4. Daniel Ricciardo, Red Bull 192
5. Kimi Raikkonen, Ferrari 148
6. Max Verstappen, Red Bull 111
7. Sergio Perez, Force India 82
8. Esteban Ocon, Force India 65
9. Carlos Sainz Jr, Toro Rosso 48
10. Nico Hulkenberg, Renault 34
Who's who in Yemen conflict
Houthis: Iran-backed rebels who occupy Sanaa and run unrecognised government
Yemeni government: Exiled government in Aden led by eight-member Presidential Leadership Council
Southern Transitional Council: Faction in Yemeni government that seeks autonomy for the south
Habrish 'rebels': Tribal-backed forces feuding with STC over control of oil in government territory
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In 2013, The National's History Project went beyond the walls to see what life was like living in Abu Dhabi's fabled fort:
How to tell if your child is being bullied at school
Sudden change in behaviour or displays higher levels of stress or anxiety
Shows signs of depression or isolation
Ability to sleep well diminishes
Academic performance begins to deteriorate
Changes in eating habits
Struggles to concentrate
Refuses to go to school
Behaviour changes and is aggressive towards siblings
Begins to use language they do not normally use
Countries recognising Palestine
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The specs
Engine: 5.0-litre supercharged V8
Transmission: Eight-speed auto
Power: 575bhp
Torque: 700Nm
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The specs: 2018 Maserati GranTurismo/GranCabrio
Price, base Dh485,000 (GranTurismo) and Dh575,000 (GranCabrio)
Engine 4.7L V8
Transmission Six-speed automatic
Power 460hp @ 7,000rpm
Torque 520Nm @ 4,750rpm
Fuel economy, combined 14.3L (GranTurismo) and 14.5L (GranCabrio) / 100km