Their deaths were confirmed by the Investigations Control Center (TsUR, Tsentr Upravleniya Rassledovaniyami), an investigative reporting outlet funded by Mikhail Khodorkovsky, a former oil magnate currently living in exile in London. 
Vifo vyao vilithibitishwa na kituo cha kudhibiti uchunguzi(TsUR) kinachotoa taarifa za uchunguzi kinachodhaminiwa na Mikhail Khodorkovsky ambaye ni mfanyabiashara wa zamani wa mafuta anayeishi uhamishoni hoko London.