PARIS (Reuters) - Syrian President Bashar al-Assad on Monday scorned allegations that his forces were behind chemical attacks in Damascus last month, and warned that any French military action against his government would trigger negative repercussions.

"Those who make accusations must show evidence. We have challenged the United States and France to come up with a single piece of proof. (Presidents) Obama and Hollande have been incapable of doing so," Mr Assad told the French daily Le Figaro in an interview.

"Anybody who contributes to the financial and military reinforcement of terrorists is the enemy of the Syrian people. If the policies of the French state are hostile to the Syrian people, the state will be their enemy," he said.

"There will be repercussions, negative ones obviously, on French interests."