Small rockets struck the Iraqi base hosting American troops and other coalition forces in Baghdad’s Green Zone early Sunday but caused no casualties and only minor damage, a U.S. military official said.

The attack came just before 3:30 a.m., according to Col. Myles B. Caggins III, a spokesman for the U.S. military operation in Iraq.

The attack was the latest in a recent series of rocket and mortar strikes on Iraqi bases housing U.S. troops. On Thursday, a mortar shell exploded in the K1 Iraqi military airbase in Kirkuk province in northern Iraq. No casualties were reported, Iraqi security officials said.

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An Iranian missile attack on Iraq’s Ain al-Asad air base on Jan. 8 injured dozens of U.S service members. It was in retaliation for the U.S. drone strike in Baghdad that killed Iran’s most powerful general, Qassem Soleimani, on Jan. 3.