Updated: 28 Dec 2020, 15:41 EXPERTS fear Russian scientists are experimenting with the deadly Ebola virus as part of a terrifying "Doomsday" chemical weapons project. Unit 68240 of Vladimir Putin's FSB spy agency - linked to the Salisbury Novichok attack - is believed to be behind a programme codenamed 'Toledo.' 5 Vladimir Putin's scientists are feared to be involved in a secretive chemical weapons programmeCredit: Reuters There are concerns the top secret unit is researching both Ebola and the even deadlier Marburg virus, reports the Mirror. Both shocking diseases cause chronic organ failure and internal bleeding and have killed thousands across Africa. One former military intelligence source said: "Both Russia and the UK have labs studying biological and chemical warfare to learn how to defend against weapons such as Novichok.