The Revolutionary Guards in Iran say the country will strike Israel's nuclear facilities if Tel Aviv attacks the Islamic state.
The Guards are the ideologically driven wing of Iran's military with air, sea and land capabilities, and a separate command structure to regular units.
The United States and Israel accuse Iran of seeking to develop nuclear bombs, a charge Tehran denies, and have not ruled out military action if diplomacy fails to resolve the row.
The Guards' commander-in-chief Mohammad Ali Jafari told Iran's Arabic language al-Alam television that if the Zionist Regime (Israel) attacks Iran, "we will surely strike its nuclear facilities with our missile capabilities."
Israel, widely believed to be the Middle East's only nuclear power, has repeatedly described Iran's nuclear programme as a threat to its existence.
Military experts say Iran rarely reveals enough detail about its new military equipment to determine its military capabilities.