THE SNP has been forced to issue another warning to so-called "cybernats" after Sir Chris Hoy was bombarded with online abuse for suggesting Scots athletes could be disadvantaged if the country votes for independence.

Scotland's greatest Olympian was subjected to personal attacks on his schooling, upbringing and cycling career on internet forums after his comments on sporting success and the referendum.

The remarks from Sir Chris , who has long resisted involvement in the referendum debate, drew hostility from people who appeared to be backing independence.

The backlash moved Scottish Office minister David Mundell to condemn the "shameful" remarks.

Meanwhile, Willie Rennie, leader of the Liberal Democrats in Scotland, said: "The nationalists seek to silence everyone they disagree with.

"If this is the kind of Scotland we'll get with independence I am sure even more will reject the nationalists' plans.

"Chris Hoy refused to express a strong view on the referendum because he feared a 'hornet's nest'. It is little surprise when he faced this abuse when he didn't get involved."

A spokesman for the SNP condemned the attacks but said online abuse was not the preserve of one political persuasion. She said Nicola Sturgeon had received death threats on Twitter and "appalling remarks" were made on the Labour Party website about Alex Salmond's father.

Some posts on social media sites criticised Sir Chris's private education. Another said: "You have just went from being a Scottish hero in the eyes of the Bravehearts to being a traitor."

A further post said: "Afraid another comment by someone no longer living in Scotland."

Sir Chris was described as a "typical Scots Tory naysayer".

The critic added: "Most folk make a career and contribute to society by doing a job of work."

The SNP spokesman added: "We join Willie Rennie in condemning these comments regardless of what party political persuasion they come from.

"Online abuse has no place in the political debate.

"All of it must stop, because the referendum debate needs to be a positive one."