Officials follow radioactive trail
The British government began tracking radioactive hotspots in London in an attempt to trace the poison that killed a former KGB agent.
Three people who reported possible symptoms of contamination were tested, but results will take several days.
Britain announced a formal inquest after the death of Alexander Litvinenko, but Home Secretary John Reid warned against rushing to conclusions about who might be responsible.
Litvinenko died Thursday of what doctors said was poisoning by polonium-210, a radioactive substance. Six sites have shown traces of radiation, one of which reportedly houses an office of self-exiled Kremlin critic and tycoon Boris Berezovsky.
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