Syria 'chemical attack': what we know

An alleged chemical attack in Syria's rebel-held Douma has sparked international outrage, with Washington warning Sunday of possible military action, while Damascus and Moscow said the reports were mere "fabrications".Syria's White Helmets, who act as first responders in rebel-held areas of Syria, said the attack took place late on Saturday using "poisonous chlorine gas"."More than 500 cases -- the majority of whom are women and children -- were brought to local medical centres with symptoms ind