Britain and France have informed the United Nations that there is credible evidence that Syria's government has used chemical weapons on more than one occasion since December, according to senior diplomats and officials briefed on the accounts.
In letters to U.N. Secretary General Ban Ki Moon, the two European powers said soil samples, witness interviews and opposition sources support charges that nerve agents were used in and around the cities of Aleppo, Homs and possibly Damascus, said the officials, who spoke on condition of anonymity because of the sensitivity of the matter.
The European reports are in part aimed at countering accusations by the Syrian government that opposition forces used chemical weapons during fighting in the town of Khan al-Asal, near Aleppo, on March 19, killing 26 people, including regime troops. Syrian rebels have said that government forces used chemical weapons in the incident.