President Barack Obama has called on the rest of the world to join the coalition combatting the group which calls itself the Islamic State.
THe US leader outlined a four-point plan for dealing with violent extremism in his annual speech to the United Nations General Assembly, taking place in New York.
The approach includes the eradication of the so-called Islamic State group, but also an effort to halt the spread of extremist ideology and address the conditions in which it thrives.
Malcolm Brown reports from the US.
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