An attache’ to President Obama just released notes that indicate that the US will not wait for the full UN investigation into the nerve gas attack.
-It is pretty clear it is a gas attack, confirmed by Medicine Sans Frontier
-the rebel do not have delivery systems to mount a chemical attack.
The easiest way for the US to attack is using cruise missiles (4 warships have been moved in the area, plus there will be some subs around there) aiming at crippling the Syrian Air Force.
Naturally the first consequence for the markets will be a spike in oil and a sell-off in shares. Then we will have to see what happens and hopefully the war will not escalate (already Lebanon is on a verge of a crisis).