Iran's president says the goal of extremists such as Islamic State who are creating chaos in the Middle East is the destruction of civilisation and the rise of Islamophobia.

Hassan Rouhani told the UN General Assembly that would create "a fertile ground for further intervention of foreign forces in our region".

He said the extremists come to the Middle East from around the world with a single ideology - "violence and extremism".

Mr Rouhani doubted the world was united against the threat posed by the extremists, saying all countries that supported them must apologise, not only to the "past generation but to the next generation".