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Iraq: How can US help combat insurgents?

US President Barack Obama says his government is looking at "all options", including military action, to help Iraq fight Islamist militants.

He said the US had an interest in making sure jihadists did not gain a foothold in Iraq.

His remarks came after the cities of Mosul and Tikrit fell to Sunni Islamist insurgents during a lightning advance.

Frank Gardner reports.

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