Alexander Litvinenko, a former Russian agent who died of radioactive poisoning, was buried today. The funeral was held according to Muslim rites, as the 43-year-old was a recent convert. British police are treating his death on November 23rd as murder. The probe has led investigators to Moscow where small traces of radiation have been found at the British Embassy. They are to interrogate a number of witnesses who met Litvinenko in London around the time he fell sick in early November. Among those is businessman and former Russian agent Alexander Lugovoy. He saw Litvinienko the day he fell terminally ill, but denies any involvement in his death. Lugovoy is also being checked for radiation contamination.