The initial post mortem tests released by British police on Thursday said that the Georgian opposition leader and wealthy businessman, Badri Patarkatsishvili died on natural causes and that his death is treated as “suspicious.”

According to Surrey police, toxicology tests will be carried out and this could take several weeks.

A statement released by police said: "Following initial inquiries and the post-mortem carried out last night, Surrey Police can confirm that at this stage there is no indication that the sudden death of Badri Patarkatsishvili was from anything other than natural causes," AFP reports.

Patarkatsishvili died Tuesday night of heart failure at his home outside Leatherhead, a suburban commuter town southwest of London. He was 52.

He was accused of plotting to oust the ex-Soviet republic's government.

Patarkatsishvili was considered the force behind the November anti-government protests in Georgia.

Patarkatsishvili ran against Mikhail Saakashvili in the elections in January, gathering only 7 percent of the vote.

He was being investigated at home for plotting to oust the government. These accusations were denied by Patarkatsishvili, but the fact that he offered sums of money to police to side with protesters he admitted. The protests were stopped by police in a brutal way.

According to police, late Wednesday they didn’t find any trace of radioactivity after the scene was studied the entire day by forensics experts.

His death generated the memories of the death of Russian KGB agent Alexander Litvinenko in November 2006 by radioactive poisoning.

Patarkatsishvili spoke about his concerns that there might a plot to murder him.

According to Surrey Police spokesman, the case was being handled by a major crime investigation team due to its high-profile nature.

At the end of Wednesday his body was taken out of the house and transported to the Royal Surrey County Hospital in nearby Guildford. In the meantime, police said that is trying to retrace Patarkatsishvili's steps in his last 48 hours.

Even though it appears that he died of a heart attack, his doctor told his family that he didn’t show any signs of heart disease at his recent medical tests.

Patarkatsishvili was the richest man in Georgia and the most controversial one.

He started being successful when he partnered with of Russian tycoon Boris Berezovsky in the 1990s, a Kremlin critic who also lives in London in exile.