John Kerry bai bata lokaci ba ya dorawasojojin shugaba Bashar Al-Assad laifin kai wannan mugun harin da ya yi babbar barna.
Harin ya lalata asibitin da kungiyar likitoci ta na gari na kowa ko Doctors without boarders a turance dake lura da asibitin.
Akalla yara ishirin da likitoci ne aka kashe cikinsu har da wani likitan yara dake aiki a yankunan da suke hannun 'yan tawaye a Aleppo.
Mr. John Kerry ya yi kira ga Rasha babbar kawar Syria da ta yi anfani da tasirinta ta gayawa shugaba Assad ya kawo karshen kai irin wannan harin.