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Media watchdog Ofcom is set to review Russian news network RT's British broadcasting licence following developments in the Salisbury poisoning investigation.

Prime Minister Theresa May said on Monday it was "highly likely" the Russian government was responsible for the nerve agent attack which left former spy Sergei Skripal and his daughter, Yulia, hospitalised last Sunday.

Following her statement, a spokesman for the British broadcast regulator Ofcom said: "The Russian news channel RT broadcasts in the UK under licences issued by Ofcom as the broadcasting regulator.

"Ofcom has an ongoing duty to be satisfied that all broadcast licensees are fit and proper to hold a licence.

"We have heard the Prime Minister's statement in the House of Commons this afternoon and we await her further statement on Wednesday. We will then consider the implications for RT's broadcast licences."

The announcement follows a wave of criticism from MPs on each side of the political divide, with foreign affairs select committee chair Tom Tugendhat saying it was "time to crack down on RT".

He told BBC Radio 5 Live: "Ofcom needs to look at whether it is a genuine news network when it is considering whether it should hold a licence or not.

"I see no reason why we should allow information warfare to be carried out on UK soil by hostile agents."

Meanwhile, in an appearance on the BBC's Andrew Marr Show on Sunday, shadow chancellor John McDonnell said he would no longer appear on the channel because it "goes beyond objective journalism".

He said: "What we are seeing from Russia Today sometimes goes beyond objective journalism.

"I have been looking at some of what’s happening in terms of the change in coverage on Russian television in particular and I think we have to step back now."

Mrs May earlier told the House of Commons the nerve agent used in the attack, revealed to be the incredibly deadly 'Novichok', was "previously produced" in Russia and that its use was "either... a direct action by the Russian state against our country or the Russian government lost control of the agent and allowed it to get into the hands of others".

She said the British government would take "much more considered action" as a result of its findings.

A spokesman for RT said: "It’s regrettable that some see baseless attacks on RT as a way to score easy PR points, but those attacks betray not just the highest principles of the British society...but the British public at large."