Obama vows to dismantle 'network of death' of ISIS

United Nations: President Barack Obama on Wednesday vowed to dismantle the "network of death" perpetuated by the Islamic State in Iraq and Syria and said the US will use its military might to roll back the terror group as he asked the Muslims to "explicitly and forcefully" reject their ideology.

Asserting that America will not succumb to threats, Obama told a gathering of world leaders at the UN General Assembly that the US would be a "respectful and constructive partner" in confronting the Islamic State militants through force.

His remarks came in the backdrop of the US and coalition partner nations launching airstrikes against the Islamic State targets, also known as ISIS or ISIL, in Syria.

"The brutality of terrorists in Syria and Iraq forces us to look into the heart of darkness...the terrorist group known as ISIL must be degraded, and ultimately destroyed," Obama said in his 6th address to the 193-member General Assembly.

He said ISIL has "terrorised all who they come across in Iraq and Syria", referring to the recent brutal beheading of two American journalists and a Briton by the terror group which had captured a large swathe of land in Iraq and Syria and declared an Islamic Caliphate.

"No God condones this terror. No grievance justifies these actions. There can be no reasoning ? no negotiation ? with this brand of evil. The only language understood by killers like this is the language of force. So the United States of America will work with a broad coalition to dismantle this network of death," he said.

In his over half-hour long speech, Obama said the ISIL has been perpetuating the "most horrific crimes imaginable" by beheading innocent human beings and distributing videos of the atrocity to "shock the conscience of the world."

Calling on the world leaders "to join in this effort", Obama said America will not act alone and does not intend to send US troops to occupy foreign lands.

"Instead, we will support Iraqis and Syrians fighting to reclaim their communities. We will use our military might in a campaign of air strikes to roll back ISIL. We will train and equip forces fighting against these terrorists on the ground.

We will work to cut off their financing, and to stop the flow of fighters into and out of the region," he said.

Obama stressed that it is time for the world, especially Muslim communities, "to explicitly, forcefully and consistently" reject the ideology of al-Qaeda and its splinter group ISIS.

"Those who continue to fight for a hateful cause will find they are increasingly alone. For we will not succumb to threats; and we will demonstrate that the future belongs to those who build ? not those who destroy," Obama added.