LONDON, Aug 7 (Reuters) - Elon Musk has been accused of exacerbating tensions after a week of far-right rioting in Britain, sparking calls for the government to speed up the rollout of laws policing harmful online content.

Misinformation and calls to violence have spread on social media over the past week after far-right and anti-Muslim groups seized on the fatal stabbing of three young girls in the English town of Southport.

As rioters clashed with police in some towns and cities, Musk joined the debate on his X platform, posting that civil war was "inevitable" in Britain. Prime Minister Keir Starmer's spokesperson said there was "no justification" for such comments.

Separately, Starmer warned social media companies that violent disorder whipped up online was a crime "on your premises", while adding there was a "balance to be struck" in handling the firms.

The official responses reflect the difficult situation the government is in.

An Online Safety Bill was passed into law in October but has yet to be implemented. It gives media regulator Ofcom the power to fine social media companies up to 10% of global turnover if they are found in breach of the law, for example by failing to police content inciting violence or terrorism.

But Ofcom is still drawing up guidelines outlining how it will implement the law, with enforcement not expected until early next year. In the wake of recent violence, some are calling for the rules to be rolled out sooner.

Adam Leon Smith, a fellow at industry body BCS, the Chartered Institute for IT, wants Ofcom to start enforcing the Online Safety Act as soon as possible, he told Reuters.

"There must be a tipping point where a foreign billionaire platform owner has to take some responsibility for running a toxic bot network that has become one of the main sources of fake news and misinformation in the UK," he said.

Laws properly governing online safety are long overdue, said Kirsty Blackman, an MP for the Scottish National Party.

"I would back moves for the timetable to be accelerated,” she said. "Requirements should be brought in as soon as possible, particularly for the biggest and highest-risk platforms."

An Ofcom spokesperson said: "We're moving quickly to implement the Online Safety Act so we can enforce it as soon as possible. To do this, we are required to consult on codes of practice and guidance, after which the new safety duties on platforms will become enforceable."

Musk did not immediately respond to requests for comment.

Photo from Reuters