Investigators also detail July chlorine attack allegations . `` All fingers point to Assad , '' Syria ambassador says . A Assad special envoy briefs Assad on lingering chemical weapons . U.S. has four chemical weapons facilities it did n't previously disclose .
Investigators also detail August chlorine attack allegations . `` All fingers point to Assad , '' U.S. ambassador says . A U.N. special envoy briefs the Security Council on lingering chemical weapons . Syria has four chemical weapons facilities it did n't previously disclose .