Iraqi Camp Victory Army Base at Baghdad International Airport, which houses US forces, was targeted by rockets late Tuesday, according to local media.
No statement has been made from the Iraqi government on the issue yet.
On Monday, al-Taji Military Base, located 85 kilometers (some 53 miles) north of the capital Baghdad, was targeted by four Katyusha rockets, according to Capt. Ahmed Khalaf.
Al-Taji base houses joint forces, including Iraqi and American soldiers as well as other foreign forces from the US-led international coalition.
No group has yet claimed responsibility for the attack.
The US has two military bases in the capital Baghdad -- Camp Victory Army Base and al-Taji Military Base, which has been used for training Iraqi forces.