Obama has 'not given orders' to strike Iraq militants

The US President has not handed down any orders for US military airstrikes against ISIS militants threatening Baghdad, or any other military intervention in Iraq, senior US defence officials have told NBC News.

The officials could not say whether President Obama had also made a decision regarding possible US military action in Iraq.

US President Barack Obama delivers a statement on the situation in Iraq. Credit: Reuters

Some 100 American soldiers and Marines arrived in Baghdad overnight to provide additional security for the US embassy and assist in any evacuations if necessary.

More: US and Iran 'prepare for direct talks' over Iraqi situation

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Islamic State leader calls for jihad in audio message

The leader of the Islamic State, formerly Isis, has released the first audiotape calling for jihad since the group renamed. The group is currently battling Iraqi forces across large parts of the country.