US defence officials say an additional warship's moved to the Mediterranean - as calls for military action against the Syrian regime grow.

It's as the US President Barack Obama considers military options in response to alleged use of chemical weapons by the Assad government.

 

President Barack Obama says allegations of fresh chemical weapons use are of "grave concern".

 

Britain's accusing the Syrian regime of being directly responsible for a deadly attack in Damascus.

 

The UN's announced a senior official's to arrive there later to press for access to the site where it happened.

Momentum's building for the international community to take action after Wednesday's attack.

The United Nations Secretary-General Ban Ki-Moon has added his voice to the global condemnation: