Conspiracy theorist David Icke believes the world is run by shape-shifting reptiles.The Australian government has banned notorious English conspiracy theorist David Icke from entering the country next month for a planned speaking tour.

Among the bizarre claims made by Icke, a former footballer and BBC sports presenter, are that the world is controlled by a cabal of giant shape-shifting reptiles, many of them Jewish, and that a group of elite Jews bankrolled Adolf Hitler and started several wars.

He also tells audiences the September 11 attacks were an inside job organised by "a network that works through government agencies, through organisations like the CIA".