UK intelligence case on Syrian chemical attack
29 August 2013 Last updated at 23:53 BST
Throughout the Parliamentary debate on Syria there have been references to the war in Iraq ten years ago - and the intelligence that was used to justify it.
On Thursday the British government made public some of its information about last week's chemical attack near Damascus.
The BBC's Security Correspondent Frank Gardner reports on the findings of the Joint Intelligence Committee and its belief that it is highly likely that the Assad regime was responsible.
This report contains images viewers may find distressing.