Tensions are rising once again between the United States and Iran, as several Katyusha rockets struck early April 6 near the facility of the US oil company Halliburton in southern Iraq — the latest in what appears to be a series of messages from Tehran and its proxies urging US military forces to get out.

No casualties or serious damages were reported, but the attack follows a number of assaults on military bases in Iraq housing US forces.

The strike came two days after militias published a statement against the US presence in Iraq: “You respect only the language of force, and on that basis you will be treated.” This is the message eight Iran-backed Shiite militias sent to US forces in Iraq in a joint statement published April 4. The statement came only days after Brig. Gen. Esmail Ghaani paid his first visit to Iraq since he succeeded Maj. Gen. Qasem Soleimani as the new head of the Quds Force of the Islamic Revolutionary Guard Corps (IRGC). Soleimani was assassinated in early January on Iraqi soil by US forces.

The signatories of the joint statement were Asaib Ahl al-Haq, Harakat Hezbollah al-Nujaba and Kataib Sayyed al-Shuhada, among others.