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Cops who investigated the Salisbury attack have evidence to suggest Russian hitmen targeted other victims in the UK, say reports.

Agents from the GRU military intelligence group are suspected of travelling to Britain at the time of two deaths linked to Moscow.

Russian businessman Alexander Perepilichnyy, 44, collapsed and died in Surrey after blowing the whistle on a Kremlin fraud.

And Scot Young, 52, a tycoon who had murky business links in Russia, was found impaled on railings beneath his London flat four years ago.

A source told Sunday Times: “A few of the high-profile, unexplained deaths are very suspicious – including Perepilichnyy and Young.”

(Image: Daily Mirror) (Image: Getty Images)

It was reported that police will re-categorise some of the deaths as “suspicious” and launch a fresh appeal for witnesses.

The news will heighten tensions between Britain and Russia’s President Vladimir Putin, who has always dismissed claims that Moscow was behind the Skripal poisonings as “nonsense”.

Last week, Young’s ex-wife Michelle, a fashion buyer, said: “I always said he was murdered.”

It comes as Novichok attack survivor Charlie Rowley, 45, told Sunday Mirror he may be left permanently blind.

“I’m one of only a handful in the world to have survived Novichok, so it’s untrod territory.

"I feel like a guinea pig. I don’t know what’s going to happen from one day to the next," he said.

(Image: Metropolitan Police)

Ex-Russian spy Sergei Skripal, 67, and daughter Yulia, 34, survived a Novichok attack in Salisbury, Wilts, in March.

No arrests have yet been made but authorities have indicated intelligence agents known as Alexander Petrov and Ruslan Boshiro - who were in the area at the time of the attack - may have been responsible.