With more sites in Scotland being tagged with graffiti promoting the  Flat Earth theory, one government official is calling for a crackdown on  the vandalizing conspiracy theorists.

Initially appearing last month on signs along Scotland's A9 highway, the crudely-scrawled messages  exhorting observers to "Research Flat Earth" have begun spreading to  other parts of the country.

The ill-conceived calls to action were recently spotted on the sides of a  number of buildings in the city of Inverness, which has drawn the ire  of a local politician.

"If we allow this vandal to get away with it, then it could just be the start," councilor Duncan Macpherson lamented to the Inverness Courier newspaper.

More on this weird story at the Coast to Coast AM website.