Foreign secretary says he has seen some proof that Assad's forces are preparing to launch chemical attack against rebelsWilliam Hague has said he has seen "some evidence" that Bashar al-Assad's regime is preparing to use chemical weapons against Syrian rebels.The foreign secretary would not give specific details of the intelligence, also seen by the US, but said it was enough to renew warnings to Assad that his regime would face action if they were deployed.American satellites and other tools have reportedly detected increased activity at several chemical weapons depots in Syria.