Iraq crisis Q&A: what do you want to know about the Isis offensive?

http://www.theguardian.com/world/2014/jun/17/iraq-crisis-isis-experts-answers-questions-iran

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On Monday, the northern Iraqi city of Tal Afar fell to jihadist insurgents, making it the third major centre in Iraq to fall in less than one week. This was the latest setback for Iraq’s government, which has been trying to re-establish control over the country’s north, since it was overrun by the Islamic State of Iraq and the Levant (Isis).

The push into Iraq from Syria by Isis, has effectively converged the crises in both countries, resulting in a wider sectarian war as Sunni militants gain pace to topple Baghdad’s Shia government. The astonishing pace of Isis' march on Baghdad have left many wondering exactly what is going on, and how things got this way.

In an effort to answer questions about the crisis, our reporters on the ground and those who have covered the region extensively are here to help. What do you want to know about Iraq's current crisis? Post your questions in the comments below and we’ll add responses from our expert panel at the end of the week.