What’s happened: On Friday evening, the US announced that it had taken custody of and indicted Mohammad Baqer Saad Dawood Al-Saadi, a senior member of the Iraqi Kataib Hezbollah militia on suspicion of collaborating with the IRGC-Quds Force to plot and execute terrorist attacks against global Jewish communities and Iranian dissident media sites on behalf of Harakat Ashab al-Yamin al-Islamiya (HAYI), which the US Department of Justice specifically identified as a “component of” Kataib Hezbollah.
- The arrest is understood to have taken place in Turkey where Al-Saadi was transiting through from Iraq on his way to Russia, with local authorities subsequently transferring him to the FBI who extradited him to the US.
- Offences Al-Saadi is alleged to have committed that were stated on a criminal complaint filed by the US Department of Justice include conspiracy to provide material support to a foreign terrorist organisation, conspiracy to provide material support for acts of terrorism, provision of material support for acts of terrorism, conspiracy to bomb a place of public use, and destruction of property by means of fire or explosive.
- Kataib Hezbollah and the IRGC are mentioned in the DoJ’s criminal which alleged that Al-Saadi acted for both organisations. It is also alleged that “Since the onset of the U.S. and Israeli military conflict with Iran that began on or about February 28, 2026 (the “Iranian Military Conflict”), Mohammad Baqer Saad Dawood Al-Saadi, the defendant, has directed and urged others to attack U.S. and Israeli interests, including by killing Americans and Jews, in retaliation for the Iranian Military Conflict and to further the terrorist goals of Kataib Hezbollah and the IRGC. AL-SAADI and his associates have planned, coordinated, and claimed responsibility for at least 18 terrorist attacks in Europe (the “European Terrorist Attacks”) as well as two additional attacks in Canada, in the name of Harakat Ashab al-Yamin al-Islamiya, a component of Kataib Hezbollah.”
- While early commentary on HAYI and its attacks against European and British Jewish communal sites acknowledged its logo’s similarity to Iranian-linked Iraqi Shia militias, the DoJ’s criminal complaint is the first time that control of HAYI has been explicitly linked to a particular group or Iranian intelligence agency.
- It is also alleged that on or around 2nd April 2026, Al-Saadi attempted to contract a “Mexican cartel member who had the capability of carrying out a terrorist attack in New York and elsewhere in the United States” to target an unnamed synagogue in New York City, and ”two prominent Jewish centres in Los Angeles, California, and Scottsdale, Arizona”. Al-Saadi allegedly specified that the attacks should be recorded.
- However, the cartel member in question is understood to have been an undercover FBI agent, working to provide evidence that would ultimately be used against Al-Saadi.
Context: Kataib Hezbollah is an Iraqi proxy of the IRGC-Quds Force which works “to establish an Iran-aligned government in Iraq, expel American forces from Iraq, and advance the regional and international interests of Iran in Iraq and the region”. It was designated as a foreign terrorist organisation by the US in 2009, and is not currently proscribed by the UK.
- Established by the IRGC-QF in 2003, Kataib Hezbollah is one of the most influential and capable Iranian-linked Shia militias operating in Iraq.
- Closely support by both the Quds Force and Lebanese Hezbollah, Kataib Hezbollah fought against British and American troops in the aftermath of the invasion of Iraq in 2003, anti-Assad Syrian rebels, and Islamic State.
- They have also been implicated in war crimes and sectarian atrocities against Iraq’s Sunni population, and abducted and held an Israel journalist and academic hostage from January 2023 to September 2025.
- Shortly after the Popular Mobilisation Units were formed to protect Iraq against the Islamic State in 2014, Kataib Hezbollah’s then Secretary General, Abu Mahdi Al Muhandis, was appointed its deputy commander underscoring his militia’s strength and importance in Iraq.
- Al Muhandis was killed in January 2020 in the US drone strike which eliminated IRGC-QF commander, Major General Qassem Soleimani, in Baghdad.
- Kataib Hezbollah are alleged to have been the last group to kill a British soldier in combat when a missile salvo fired at Camp Taji in retaliation for Soleimani and Al Muhandis’s deaths fatally injured Lance Corporal Brodie Gillon of the Royal Army Medical Corps on 12th March 2020.
- Since 7th October 2023, Kataib Hezbollah are understood to have joined the Islamic Resistance of Iraq, a novel coalition of anti-US and Israel Iranian backed Shia militias. IRI subsequently launched dozens of mostly unsuccessful missile and drone attacks against Israel and US bases in the region, sometimes in what was claimed as joint operations with the Houthis.
- In late-January 2024 an IRI drone strike killed three US troops stationed in Jordan. An October 2024 strike on the Golan Heights killed two IDF troops.
- In August 2024, Iran International reported that Kataib Hezbollah was targeting Jewish communities in Central Asia with attempted but ultimately unsuccessful plots in Uzbekistan and Pakistan.
- Attacks linked to HAYI, now identified by the US Department of Justice as a component of Kataib Hezbollah, have included multiple attacks across Europe, with six attacks on targets in London alone. This includes the Golders Green stabbings, for which the group has claimed responsibility, however, in this instance there is no evidence of a direct connection.
Looking ahead: As the trial continues, further disclosure about Kataib Hezbollah, HAYI, and broader Iranian state-sponsored terrorism targeting diaspora Jewish communities is both likely and expected.
- Before Al-Saadi’s arrest and indictment, the British government were viewing and responding to HAYI as an Iranian intelligence service proxy, with policy proposals handrailing the National Security Act which criminalises assisting foreign intelligence services where such conduct is likely “prejudicial to the safety or interests of the United Kingdom”.
- It is a realistic possibility that recent developments from America may influence the UK to expand its proscription application, specifically to designate Kataib Hezbollah as a terrorist group if Al-Saadi is found guilty of relevant charges.


