British Home Secretary John Reid said police are now treating the death of
Russian spy Alexander Litvinenko as suspicious.
Speaking at a Scottish Labour Party conference in Oban, Secretary Reid said
this development marks a new stage of the case.
``As at this stage, they're saying to me that they now regard the death as
suspicious. That wasn't the case yesterday, for instance," he said.
"They're now saying, however, that they keep all possible options and avenues open."
Secretary Reid said he did not believe politicians should not involve themselves in police matters and that he was not in a position to comment on possible involvement of a foreign state.
Alexander Litvinenko, an ex-KGB spy, died in London on Thursday night.
Doctors found traces of polonium 210, a deadly radioactive substance, in his body.
Litvinenko was a bitter opponent of Russian leader, Vladimir Putin.
UK police have travelled to Moscow today to continue their investigation.