"We do want to help the Iraqis develop the capability to target these networks effectively and precisely," the senior administration official said, after a two-hour meeting between US Vice President Joe Biden and Iraqi Prime Minister Nuri al-Maliki.
Unrest in Iraq has reached a level unseen since 2008 and killed more than 5,350 people this year, as Iraqi authorities have so far failed to curb daily attacks despite carrying out a swathe of operations and implementing several tightened security measures.
Many militants were slipping into Iraq from Syria, armed with heavy weapons.
Washington now had "a pretty good handle now on the Islamic State of Iraq and the Levant networks and where they are and where it's coming from," he said.
More From This Section
"We're kind of increasing expert cooperation with the Iraqis in terms of developing that information base. But we really want to help the Iraqis have a better vision of what they face so they can target it effectively."
He refused to go into details, but the Washington Post reported that Baghdad was hoping to buy US-made Apache helicopters.
A group of US senators yesterday accused Maliki of contributing to an alarming slide back into a sectarian war.
"By too often pursuing a sectarian and authoritarian agenda, Prime Minister Maliki and his allies are disenfranchising Sunni Iraqis, marginalizing Kurdish Iraqis, and alienating the many Shia Iraqis who have a democratic, inclusive and pluralistic vision for their country," the letter said.