Barack Obama addresses UN General Assembly
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Full speech: US President Barack Obama at UN

US President Barack Obama has delivered his speech to the 67th United Nations General Assembly at its headquarters in New York.

He urged global leaders to rally against extremism, saying it was the obligation of all leaders to speak out forcefully against violence and extremism, as he framed his speech with references to the US ambassador murdered in Libya.

Unrest across the Middle East is set to dominate discussion at the summit.