Iran on Monday blamed Israel for a sabotage attack on its underground Natanz nuclear facility that damaged the centrifuges it uses to enrich uranium there.
Tehran warned that it would take revenge for the assault.
The comments by Foreign Ministry spokesman Saeed Khatibzadeh are the first official accusation levelled against Israel for the incident Sunday that cut power across the facility.
Israel has not directly claimed responsibility for the attack. However, suspicion fell immediately on it as Israeli media widely reported that a devastating cyberattack orchestrated by Israel caused the blackout.