15 September 2014
Last updated at 20:46 ET
It said that the attacks took place on Sunday and Monday near Mount Sinjar and south-west of Baghdad.
They were the first made as part of expanded efforts outlined by US President Barack Obama last week.
Meanwhile Iraq has criticised the decision not to invite Iran to an international summit on the IS threat.
Foreign Minister Ibrahim al-Jaafari said the decision was "regrettable".
Thirty countries pledged to join a US-led coalition against IS in Paris.
The militant group, which originated in Syria, has swept through parts of western and northern Iraq in recent months and now controls large areas of both countries.
Obama decision The US military statement said that the airstrike south-west of Baghdad was the first taken as part of "expanded efforts beyond protecting our own people and humanitarian missions to hit [IS] targets" as Iraqi forces go on the offensive.
It said that the strikes were in support of the troops, adding
that six IS vehicles were destroyed near Sinjar, and a militant fighting
position south-west of Baghdad.
The statement said that all aircraft exited the strike areas safely.
The US has conducted a total of 162 airstrikes across Iraq since August.
Officials say the latest strikes reflect the recent decision by President Obama to attack IS positions wherever they are.
Previous US airstrikes in Iraq were carried out to protect American interests and personnel, help Iraqi refugees and secure infrastructure.
Monday's talks in Paris had been called to agree a strategy to
combat IS, which the CIA estimates to have between 20,000 and 31,000
fighters in Iraq and Syria.
Speaking after the conference ended, Mr Jaafari said that he regretted the absence of Iran.
"We believe that all world countries are concerned about the danger of terrorism" he said.
"Iran is our neighbour, it assisted us and it should have been
present, but we are not the party responsible for inviting parties," he
added.
He went on to say that he does not expect foreign ground troops to become militarily involved in either Iraq or Syria.
Together, Iran and Syria share most of Iraq's borders, but relations between them and the US are fraught.
Last week US Secretary of State John Kerry ruled out co-operation with Iran, citing its "engagement in Syria and elsewhere".
But Iranian Supreme Leader Ayatollah Ali Khamenei said on Monday that the US had requested Iran's co-operation via the US ambassador to Iraq.
"I said no, because they have dirty hands," he said. He added the US was seeking a "pretext to do in Iraq and Syria what it already does in Pakistan - bomb anywhere without authorisation".
Syria also did not take part in the Paris gathering.
Meanwhile, France said it had begun surveillance flights over Iraq. Britain revealed in August that its aircraft had been gathering intelligence over Iraq.
The militant group's former name was Isis and it has also been known as Isil (Islamic State in Iraq and the Levant).
Analysis: Jeremy Bowen, BBC News, Damascus
Another layer of conflict is being grafted on to a series of parallel and overlapping wars in Syria and Iraq.
Enemies of the Syrian regime, including Saudi Arabia, will want to calculate how much their actions against Islamic State might strengthen President Bashar al-Assad - who has men tied up fighting IS.
Iran and Saudi Arabia, regional superpowers, back opposing sides in Syria. They will look very closely to see if American actions indirectly help their rival.
Some Islamist fighters in Syria who have been trained and armed by Saudi Arabia or Qatar have already gravitated to IS. Opposition to Western involvement might make more follow.
And the US and its Western allies are becoming direct players in the wars in Syria and Iraq - and in the deepening sectarian conflict between Shia and Sunni Muslims.
Many argue that the Americans and the British tore open sectarian scars when they invaded Iraq in 2003, and now risk making matters even worse.
Daunting task ahead for US-led coalition
How will Obama's anti-IS coalition work?
US airstrikes to support Iraqi troops under attack
TO SEE VIDEOS:
http://www.bbc.com/news/world-middle-east-29214785
Gabriel Gatehouse reports from the front line of Peshmerga-held territory in northern Iraq
The
US has carried out airstrikes in Iraq in support of troops who were
being attacked by Islamic State (IS) fighters, the US military has said.
They were the first made as part of expanded efforts outlined by US President Barack Obama last week.
Meanwhile Iraq has criticised the decision not to invite Iran to an international summit on the IS threat.
Foreign Minister Ibrahim al-Jaafari said the decision was "regrettable".
Thirty countries pledged to join a US-led coalition against IS in Paris.
The militant group, which originated in Syria, has swept through parts of western and northern Iraq in recent months and now controls large areas of both countries.
Obama decision The US military statement said that the airstrike south-west of Baghdad was the first taken as part of "expanded efforts beyond protecting our own people and humanitarian missions to hit [IS] targets" as Iraqi forces go on the offensive.
Ibrahim al-Jaafari said Iran was a neighbour that had "assisted" Iraq
The statement said that all aircraft exited the strike areas safely.
The US has conducted a total of 162 airstrikes across Iraq since August.
Officials say the latest strikes reflect the recent decision by President Obama to attack IS positions wherever they are.
Previous US airstrikes in Iraq were carried out to protect American interests and personnel, help Iraqi refugees and secure infrastructure.
Francois Hollande told the conference Islamic State represented a global threat
Speaking after the conference ended, Mr Jaafari said that he regretted the absence of Iran.
"We believe that all world countries are concerned about the danger of terrorism" he said.
Thirty countries pledged to increase military assistance to the Iraqi Army
He went on to say that he does not expect foreign ground troops to become militarily involved in either Iraq or Syria.
Together, Iran and Syria share most of Iraq's borders, but relations between them and the US are fraught.
Last week US Secretary of State John Kerry ruled out co-operation with Iran, citing its "engagement in Syria and elsewhere".
But Iranian Supreme Leader Ayatollah Ali Khamenei said on Monday that the US had requested Iran's co-operation via the US ambassador to Iraq.
"I said no, because they have dirty hands," he said. He added the US was seeking a "pretext to do in Iraq and Syria what it already does in Pakistan - bomb anywhere without authorisation".
Syria also did not take part in the Paris gathering.
Meanwhile, France said it had begun surveillance flights over Iraq. Britain revealed in August that its aircraft had been gathering intelligence over Iraq.
The militant group's former name was Isis and it has also been known as Isil (Islamic State in Iraq and the Levant).
Enemies of the Syrian regime, including Saudi Arabia, will want to calculate how much their actions against Islamic State might strengthen President Bashar al-Assad - who has men tied up fighting IS.
Iran and Saudi Arabia, regional superpowers, back opposing sides in Syria. They will look very closely to see if American actions indirectly help their rival.
Some Islamist fighters in Syria who have been trained and armed by Saudi Arabia or Qatar have already gravitated to IS. Opposition to Western involvement might make more follow.
And the US and its Western allies are becoming direct players in the wars in Syria and Iraq - and in the deepening sectarian conflict between Shia and Sunni Muslims.
Many argue that the Americans and the British tore open sectarian scars when they invaded Iraq in 2003, and now risk making matters even worse.
Daunting task ahead for US-led coalition
How will Obama's anti-IS coalition work?
Islamic State
Features and Analysis
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Will Obama's strategy to tackle IS work?
Allied questions
-
Syria crucial
-
Vote or veto?
-
Hostages held by IS
-
Sunnis ready to take on IS
-
Turkey and IS
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