British Foreign Secretary Says the UK is Concerned That Syria May Have Used Chemical Weapons
Still unclear if chemical weapons were used by Assad's regime or the rebels
The UK is increasingly concerned there is evidence that chemical weapons have been used in Syria.
Foreign Minister William Hague said the claims must be urgently investigated and perpetrators held to account.
Meanwhile, soil samples gathered from random sites in Syria, have been smuggled to the UK for testing, British intelligence sources told the BBC.