Footage shows ISIS militant on captured government tank
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Iraq crisis: Militants push towards Baghdad

The advance through Iraq of the Islamist militant group ISIS continues to cause alarm in Baghdad and beyond.

The Iraqi government insists it has a plan to defend the city, and the country's most senior Shia cleric has urged people to take up arms against the insurgents.

The UN says hundreds have been killed - with militants carrying out summary executions of civilians in Mosul.

Nick Childs reports.

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