Iraq's army chief General Babaker Zebari (right) meets US Army General Martin Dempsey
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General Martin Dempsey meets US troops in Iraq

The United States' most senior military officer, General Martin Dempsey, has been meeting US commanders in Iraq.

They are preparing to expand US assistance to Iraqi and Kurdish forces fighting Islamic State militants.

After visiting Baghdad, General Dempsey went on to Irbil, capital of Iraq's semi-autonomous Kurdish region. Tom Esslemont reports.

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