Latest: Use of chemical weapons in Syria must not go "unchallenged", says UK Cabinet

Downing Street has said the UK Cabinet agreed the use of chemical weapons in Syria must not go "unchallenged" but gave no immediate details of UK involvement in any military action against the regime of Bashar Assad.

Story so far:
• Trump says decision on Syria will be made 'fairly soon' after earlier vague tweet
• France claims it 'has proof' Syria used chlorine
• Italy and Germany will not partake in direct military action
• UK said use of chemical weapons in Syria must not go "unchallenged" but gave no details of UK involvement in military action