UK's News of the World newspaper claims that they know who poisoned former Russian spy Alexander Litvinenko, but only print his middle name - Igor "for legal reasons."

The 46-year-old expert in covert operations belonged to Russia's Spetsnaz special forces, the paper states and was fingered in a document Litvinenko received right before he was poisoned with radioactive polonium-210.

Litvinenko handed Scotland Yard the dossier he received at London's Itsu sushi bar, and it contains a long hit-list with his name on top, News of the World claims.

Since Litvinenko's death, several UK locations and planes have tested positive for traces of the radioactive material, and Italian academic Mario Scaramella who met Litvinenko in the bar was also infected. "Significant" amounts of Polonium-210 have been detected in his urine, it was disclosed Friday.He is the first person to test positive since Litvinenko's death sparked a radiation alert.

Litvinenko died on November 23, and pathologists have finished performing the autopsy that was to determine the exact cause of death and establish how the radioactive isotope entered his body.

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