Speaking to the CBS network in the United States, Bashar al-Assad said the US had no evidence that his regime carried out a chemical weapons attack.

The warning comes as the US Secretary of State holds talks in London with the British Foreign Secretary.

John Kerry says President Assad has the ability to prevent a possible military attack if he hands over all of his chemical weapons within the next week.

But President Assad says America should expect 'every action' if they attack his nation: