London police: Death of Putin critic Berezovsky unexplained

London forensics experts found no poisons to explain the mysterious death of Boris Berezovsky, a Jewish oligarch and Kremlin critic.
Russia's Channel One reported that the 67-year-old Berezovsky's body was found Saturday in the bathroom of his home in the London area, and that he had suffered a heart attack last week. But Thames Valley police said his death was being treated as "unexplained," the Guardian reported.
"Officers found nothing of concern in the property and we are now progressing the investigation as normal," said a statement from police about tests for poisons, biological or chemical.