British police say experts found no hazardous materials in their search of the property where self-exiled Russian tycoon Boris Berezovsky's body was found, AP reported.

Berezovsky, a 67-year-old onetime Kremlin kingmaker who fled to Britain after a bitter falling out with Russian President Vladimir Putin, was found dead Saturday, March 23 at the property in Ascot, a town 40 kilometers (25 miles) west of London.

Police are treating his death as "unexplained."

They said Sunday that officers specially trained in chemical, biological and nuclear materials have given the scene the "all clear."

They say the majority of the cordon around the property has now been lifted and crime scene officers are carrying out a full and thorough investigation to determine the circumstances around Berezovsky's death.