US General says American decision to use force in Syria could cost billions

The top US military officer has outlined the costs, risks and benefits of possible American military involvement in the Syrian conflict.

But he said using force in Syria would be "no less than an act of war" and could cost the US billions of dollars.

Washington has so far ruled out military intervention in Syria.

MORE:  http://www.bbc.co.uk/news/world-middle-east-23414906