Two rockets were fired towards the Green Zone where the US embassy is located in Baghdad on Saturday night, according to Iraq's Security Media Cell.
The C-RAM defense system was activated to intercept the rocket fire. One rocket was intercepted, while a second rocket fell near the Grand Festivities Square near the Green Zone, causing damage to two civilian vehicles.
No group has yet taken responsibility for the rocket attack.
The attack comes as the New Years' deadline set by Iran-backed militias in Iraq for the withdrawal of US forces from the country nears. The militias have threatened to attack US forces in the country if they stay after December 31st.
The US-led coalition conducting Operation Inherent Resolve in Iraq announced on December 9 that it had completed its transition to a non-combat role, but would keep troops in Iraq to advise and assist Iraqi forces.