The Iranian government’s responses to past such incidents have appeared confused but the Rezaie case has surpassed previous levels, with the authorities speaking in strikingly different voices from the outset.

“Assassinations will continue to be a tool used in this covert war. While it’s impossible to tell with certainty whether Rezaie was an active nuclear scientist, his death appears to be another episode in that war,” said London-based analyst Ghanem Nuseibeh, founder of Cornerstone Global Associates.

“The Iranian narrative has been confused about Rezaie’s work and this adds credence to the speculation that he has been involved in the nuclear programme.”