While some European Union states have temporarily banned short-selling, the FCA said that it, most European countries and the United States have not introduced such curbs.

"Aggregate net short selling activity reported to FCA is low as a percentage of total market activity and has decreased in recent days. It will continue to fluctuate, but there is no evidence that short selling has been the driver of recent market falls," the FCA said.

(Reporting by Huw Jones; Editing by Hugh Lawson)