The Revolutionary Guards said Iran would impose controls on shipping in the vital Gulf oil route if Iran was attacked and warned regional states of reprisals if they took part, newspaper reports said today.
Fear of an escalation in the standoff between the West and Iran, the world's fourth largest oil producer, have been one factor propping up sky-high oil prices. Crude hit a record level on international markets near $143 a barrel on Friday.
Speculation about a possible attack on Iran because of its disputed nuclear ambitions has risen since a report this month said Israel had practised such a strike, prompting increasingly tough talk of retaliation, if pushed, from Tehran.
"Naturally every country under attack by an enemy uses all its capacity and opportunities to confront the enemy," Guards commander-in-chief Mohammad Ali Jafari told Jam-e Jam newspaper in some of the toughest language Iran has used so far.
Analysts say Iran may not match the firepower of US forces but could still cause havoc in the region using unconventional tactics, such as deploying small craft to attack ships, or using allies in the area to strike at US or Israeli interests.
"Regarding the main route for exiting energy, Iran will definitely act to impose control on the Persian Gulf and Strait of Hormuz," Jafari said of the Gulf waterway through which about two-fifths of all globally traded oil passes.
Iranian officials have in the past sent mixed signals about whether Iran would use oil as a weapon. But such threats, when made, have sent jitters through the crude market for fear of disrupting supplies from big Opec producers in the Gulf.
The Islamic Republic insists its nuclear programme is peaceful and aimed at generating electricity. But the West and Israel fear Iran is seeking to build atomic bombs. Israel is believed to be the only Middle East state with nuclear arms.