But even when it 's done , the U.N. will only say whether chemical weapons were used -- not who was responsible . NEW : U.N. condemns attack , blames Syrian government . Tom Watkins says blood and hair samples show `` signatures of sarin '' The Arab League says its investigation will be `` impartial and credible '' jihadists opposition : Obama has given false hope to those suffering .
NEW : U.N. condemns attack , blames Syrian government . Tom Watkins says blood and hair samples show `` signatures of sarin '' The Arab League says its investigation will be `` impartial and credible '' jihadists opposition : Obama has given false hope to those suffering .