At least seven Russian oligarchs close to Vladimir Putin have mysteriously died in recent months in Russia.
Many think that they may have been killed, to "purge" all those who opposed Putin and his policies.
Their deaths occurred under mysterious circumstances.
But sources believe they may have been murdered as there are alleged similarities in their deaths.
The latest apparent casualty was Ivan Pechorin – Putin's point man for developing Russia's vast Arctic resources.
He fell from a boat in the waters near Russky Island under mysterious circumstances.
His death came just weeks after oil magnate Ravil Maganov died after "falling from a hospital window".
The 64-year-old, who was the head of Russian oil giant Lukoil, reportedly died after falling from a sixth-floor window at Moscow's Central Clinic Hospital. At that time it was said that his wife was in the next room, while after the "throwing" no note was found that he could have left behind.
However, the anti-Kremlin Telegram channel General SVR claimed that Maganov was killed on Putin's orders.
But these are just a few of the latest mysterious deaths among the former Kremlin inner circle since the war in Ukraine began.
On February 25, a day after Putin ordered his troops into Ukraine, the body of Alexander Tyulakov, a senior Gazprom financial and security official at the level of deputy general director, was found dead.
He was found with a rope around his neck in his £500,000 home.
Just three weeks ago, in the same elite villas, in the Leningrad region, Leonid Shulman, the head of transport at Gazprom Invest, was found dead, writes The Sun.
Meanwhile, oligarch Vladislav Avayev, 51, a former deputy president of Gazprombank and former Kremlin official, was found shot to death in his Moscow apartment.
A few days later, Sergey Protosenya, 55, was found dead, hanged in Spain.
Protosenya was a former deputy chairman of Novotek, a company closely linked to the Kremlin.
In March, the body of Russian billionaire Vasily Melnikov was found in his luxury apartment with stab wounds in the city of Nizhny Novgorod.
It is the data that raises suspicions that all seven oligarchs may have been killed amid fears that Putin is purging his inner circle as his invasion of Ukraine continues to fail.