Volunteer Salam Brigade fighters between Baghdad and Mosul
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The worsening divisions between Sunni and Shia Muslims in Iraq

There are fears Iraq is descending into sectarian warfare as Shia militias have become the main fighting force since the Iraqi army was defeated by Islamic State (IS).

In particular, the Sunnis are concerned by the controversial role of the militia groups and fear the weapons may be turned on them

A report by campaign group Amnesty International has said Shia militias in Iraq have kidnapped and killed scores of Sunni civilians in recent months.

The BBC's Sally Nabil reports from Samarra.

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