The 500 pound bombs were dropped near Irbil on a Islamic State of Iraq, or ISIS, military artillery unit. They were dropped from F-18s that launched from the Carrier USS George H.W. Bush.
Three US jets also dropped over 50 bundles of relief supplies to help tens of thousands of refugees trapped on a mountaintop surrounded by militants. The 40,000 people include Christians and members of a small sect named Yazidi.
President Obama said he will not send US ground troops to fight.
This marks the first combat activity in Iraq since 2011.
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