Obama would chair a meeting of the UN Security Council on the threat posed by foreign terrorist fighters.
The strikes were part of the expanded military campaign that Obama authorized nearly two weeks ago.
We will use our air power. We will train and equip our partners. We will advise and we will assist, he said.
The military action will end only when they have ended the capacity of ISIL to engage in broad-based terrorist activity.
Abbott said there was a “serious risk from a terrorist attack” days after Australia raised its national terror threat level to “high”.
“It’s a very dangerous phenomenon, and we all need to be aware of how to deal with this issue,” said Iran FM.
The comprehensive approach to degrade and ultimately destroy ISIL requires a wide range of efforts, said Obama.
“I saw no point in cooperating with a country whose hands are dirty and intentions murky,” said Ayatollah.
“The air strike southwest of Baghdad was the first strike taken as part of our expanded efforts beyond protecting our own people,” said US.
The IS extremists released a video showing the beheading of aid worker Haines, who was abducted in Syria last year.
The ultimate aspiration of al-Qaeda was always the formation of an Islamic caliphate.
Barack Obama said the US will continue to draw on its substantial counterterrorism capabilities to prevent ISIL attacks.
IS is a Middle-East based Sunni jihadist group which has threatened to demolish all Shia shrines.
It is the first time that Washington has carried out air strikes in support of Sunni Arab tribal militia.
Obama said the Iraq’s security forces needed help from the US and the international partners to succeed.