Counter-terror police are leading an investigation into the "unexplained" death of a man in London, APA reports quoting BBC.
He is believed to be Russian businessman Nikolai Glushkov, who claimed political asylum in the UK after being convicted of fraud.
The Metropolitan Police said its specialist unit was looking into it "as a precaution because of associations that the man is believed to have had".
There was no evidence linking the death to the incidents in Salisbury, it said.
In a statement, it said the man in his 60s had been found at a residential address in New Malden on Monday night.
The man has been identified, but not formally. However, next of kin have been informed.