20 August 2012 Updated at 15:40 ET
Obama warns Syria chemical weapons use may spark US action
Obama: "It doesn't just include Syria. It would concern allies in the region, including Israel, and it would concern us."
Syria conflict
Will Kurds benefit from the crisis?
Map of territory 'controlled'
Fear and hunger in Aleppo
The rise of jihadist groups
US President Barack Obama has said the use of chemical weapons by Syria would be a "red line" that would change his thinking on intervention in the crisis.
link-
http://www.bbc.co.uk/news/world-middle-east-19319446