British officials say two more people have tested positive for the same radioactive poison that killed former Russian spy Alexander Litvinenko a week ago.
The officials said a female member of Litvinenko's family had shown traces of polonium-210, but not in amounts to be life threatening.
Earlier, doctors at London's University College Hospital had confirmed that Italian academic Mario Scaramella was hospitalized Friday after he had also tested positive for the same rare radioactive substance.
But the doctors said Scaramella had been exposed to a much lower dose of radiation than Litvinenko and currently shows no symptoms of radiation poisoning. Scaramella had met with Litvinenko at a London restaurant the day the former spy became ill.
Also today, scientists in London performed an autopsy on Litvinenko's body.
British authorities say examiners wore full protective clothing to avoid contamination by the toxic substance found in Litvinenko's body.
Litvinenko died last week after saying he was poisoned for his opposition to Russian President Vladimir Putin. The Kremlin denies the allegations.
Earlier today, Russian Foreign Minister Sergei Lavrov told reporters he is waiting for "concrete questions" from British authorities investigating Litvinenko's death. He says Russia is prepared to answer all questions thoroughly.