The official confirmed a New York Times report about the weapons shipment. The daily said 75 Hellfire missiles were purchased by Iraq and delivered by Washington last week.
The State Department official confirmed the "recent delivery" of Hellfire missiles and an "upcoming delivery of Scan Eagles" -- reconnaissance drones that are a smaller version of the larger Predator drones that once were frequently flown over Iraq.
"The United States is committed to supporting Iraq in its fight against terrorism," the official added, saying that the effort aims "to strengthen their capabilities to combat this threat."
Officials in Washington said the support is being sent under the "strategic framework agreement" between Iraq and the United States.
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Administration sources told the Times that the weapons delivery comes as the Iraqis had virtually run out of Hellfire missiles.
The weapons shipments are being delivered as Baghdad confronts the worst wave of Islamic militant violence in half a decade.
Yesterday, at least 44 people were killed in attacks across the country, including the bombing of a market near a church in Baghdad.
Militants frequently attack places where crowds gather, including markets, cafes and mosques, in an effort to cause maximum casualties.
Experts say widespread discontent among Iraq's minority Sunni Arab community is a major factor fueling the surge in unrest.
More than 6,700 people have been killed in Iraq since the beginning of 2013, according to AFP figures based on security and medical sources.