The US has condemned the rocket and mortar attack that killed six people and wounded dozens of others at a refugee camp near Baghdad's international airport.
State Department spokeswoman Victoria Nuland denounced "the vicious and senseless terrorist attack" and offered condolences from the US to the families of the victims.
She noted that the Iraqi government is investigating the attack and called on it to take all appropriate measures to enhance security for its people.
More than 3,000 people live at the camp, which houses members of Mujahedeen-e-Khalq, or MEK, the militant wing of a Paris-based Iranian opposition group, the National Council of Resistance of Iran.
Iraq's Shiite-led pro-Iranian government considers MEK a terrorist group and is eager to have it out of the country.
The government has asked the international community to speed up the resettlement of the refugees.