Early on the morning of July 2, 2020, a fire and then an explosion were reported at an above-ground building in the Natanz nuclear enrichment facility, which was later ascertained to be a centrifuge assembly building.
A bomb planted by an insider and not a suspected Israeli cyber-attack may have caused the explosion several analysts later asserted.
"The majority of the Revolutionary Guards believe that someone carried a bomb to the building," A member of the Revolutionary Guard was quoted as saying by various media.
The bomb theory gains credence from the nature of explosion- a blast with impact spreading outwards.