The leader of an Islamist insurgency in the North Caucasus, Doku Umarov has been declared dead on the group’s website.
Described as Russia’s most wanted man, Umarov is believed to have been responsible for several deadly bombings.
It is not known how he died but the website said the rebel leader had already been replaced.
His death, if confirmed, marks a success for President Vladimir Putin in his attempts to end the violent struggle against Russian rule in Chechnya and Dagestan.
Get a different perspective
Every story can be told in many ways: see the perspectives from Euronews journalists in our other language teams.