From CNN.com:

The number of sites contaminated in the Russian spy radiation alert has doubled to around 12 and is likely to rise again, British Home Secretary John Reid said.

He also disclosed that a fourth jetliner -- three British Airways planes had been named the previous day -- had also been caught up in the scare.

That Russian aircraft was later given a clean bill of health for traces of alpha radiation -- the type emitted by polonium 210, the deadly radioactive element with which former Russian spy Alexander Litvinenko was poisoned.

Meanwhile Russian doctors said they had identified no natural cause for an ailment afflicting Yegor Gaidar, architect of Russia's market reforms, Gaidar's spokesman said on Thursday.

Gaidar, 50, became violently ill and was rushed to a hospital in Ireland, but was improving in a Moscow hospital Thursday.

Also on Thursday a coroner formally opened an inquest into the poisoning of Litvinenko, who died on November 23 after falling ill more than three weeks earlier. It was quickly adjourned so police could continue their investigation, but three pathologists were expected to participate in an autopsy Friday at Royal London Hospital.  more

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This is a weird story.  I'm not sure what to make of it.