What is Kataib Hezbollah?: An Iran-backed Iraqi Shia militia and one of the most powerful factions in Iraq's Popular Mobilisation Forces. The US designated it a terrorist organisation in 2009.
Is Kataib Hezbollah fighting the US?: Kataib Hezbollah declared it "will not remain neutral" on 1 March 2026. The US embassy in Baghdad was targeted by rockets and militias attacked US bases at Baghdad airport and Irbil.Source: event
Is Kataib Hezbollah the same as Hezbollah?: No. Kataib Hezbollah is an Iraqi militia. Hezbollah (Lebanese) is a separate organisation in Lebanon. Both are funded by Iran's IRGC but operate independently.
Who attacked the US embassy in Baghdad in 2026?: Hundreds of protesters attempted to storm the US embassy on 1 March 2026. The compound was later targeted by rockets. Kataib Hezbollah had declared its intent to enter the conflict hours earlier.Source: event
What are Iraq's Popular Mobilisation Forces?: An umbrella of Iraqi militia groups formally integrated into Iraq's security forces. Several factions, including Kataib Hezbollah, receive IRGC funding and operate with significant autonomy from Baghdad.

Background

When the US-Israeli strikes on Iran began on 28 February 2026, Kataib Hezbollah declared it "will not remain neutral", the most direct signal that Iranian-aligned Iraqi militias were preparing to enter the conflict. Hundreds of protesters subsequently attempted to storm the US embassy in Baghdad. The embassy compound was later targeted by rockets, with defence systems activated.

Kataib Hezbollah is an Iranian-aligned Iraqi Shia militia and one of the most powerful factions within Iraq's Popular Mobilisation Forces (PMF). The US designated it a terrorist organisation in 2009. It has received funding, training and weapons from Iran's IRGC Quds Force since its founding, and operates as Tehran's primary Iraqi proxy.

Iraq has become a fifth operational front in the conflict. Saraya Awliya al-Dam, a separate Iraqi militia, claimed drone attacks on US forces at Baghdad International Airport and a base in Irbil. The militia ecosystem operates with sufficient autonomy that individual groups can escalate without a direct Iranian order, complicating any Ceasefire.

Source Material

Kata'ib Hezbollah

How the World Sees Them

Iran

Kataib Hezbollah is Tehran's primary Iraqi proxy, extending IRGC reach into US basing areas. Militia autonomy means Iran can escalate through proxies while denying direct orders.

Iraq

Baghdad's government cannot control PMF factions that are formally part of its security forces. Militia escalation risks dragging Iraq into a war it did not choose.

United States

Washington considers Kataib Hezbollah a direct threat to US forces in Iraq. Embassy rocket attacks and airport strikes opened a fifth front the US did not plan for.