Pentagon says it will not tolerate attacks on its military. Three American soldiers were killed in an attack on a military base in Iraq.

The base is home to approximately 350 military personnel. The attack was carried out by Iranian-backed militants, according to reports. The U.S. government says it has no connection with the attack. The incident is under investigation by the U.N. and the State Department. It is not known if the attack was linked to Iran or to the Islamic Resistance.