Iraq crisis: Isis video 'shows UK and Australian fighters'

A video posted online by Isis militants claims to show British and Australian nationals urging Muslims to join them in holy war in Iraq.

Iraqi government forces have engaged with the Islamist-led militants in battles for Baiji oil refinery and Tal Afar airport in northern Iraq.

The fighting comes a day after the US said it would send some 300 military advisers to aid in the fight against the insurgents.

Paul Adams reports.