Iranian lawmakers on Sunday delayed taking action on a proposed bill to immediately cut oil exports to Europe in retaliation for an EU oil embargo, the parliament's energy commission said.
"No bill has been designed nor has it come to the parliament," commission spokesman Emad Hosseini told Mehr news agency.
He said he hoped negotiations on preparing the bill would be finalised before Friday.
Lawmakers had initially been expected to enter the bill into parliament on Sunday, after calling for it to be drafted under "double emergency" procedures.
The proposed text aims to immediately halt oil exports to Europe in a bid to destabilise the fragile economies of several EU states.
It was called in retaliation for an EU embargo on Iranian oil announced 16 January but whose implementation was meant to be phased in over the next five months to give struggling EU economies, such as Greece and Spain, time to find alternative oil suppliers.
But Hosseini said there was no bill yet, just "an idea by lawmakers" that still had to be studied by the energy commission before one could be drafted.
Iranian officials and lawmakers have expressed anger at the EU ban, which is designed to pressure Tehran to halt its nuclear activities. Western countries allege Iran is seeking a nuclear weapon, despite Tehran's denials.
Iran is the second-biggest producer in OPEC, behind Saudi Arabia. It pumps some 3.5 million barrels a day, and exports 2.5 million of them.
Around 20 per cent of the exports go to EU countries, mainly Italy, Spain and Greece. Most of the rest goes to Asia, principally China, India, Japan and South Korea.
Ahmad Qalebani, the head of the National Iranian Oil Company (NIOC), was quoted by ISNA news agency as saying Iran was ready to stop its exports to Europe at a moment's notice, and that clients elsewhere in the world were willing to buy the oil.
He said of European companies: "Either they immediately stop buying Iranian oil, or they decide to keep long-term relationships" with the NIOC.
Qalebani also warned that, if exports to Europe were halted, EU companies that had Iranian oil shipments owing to them would be hurt.
"They would be disadvantaged and they would have a problem getting their capital back," he said.
That warning could worry Italian oil giant ENI, which has an estimated two billion dollars (1.6 billion euros) in oil owed to it by the NIOC. Italy signed on to the EU ban on Iranian oil on condition that those "buy back" shipments would not be affected.
Qalebani also reiterated, according to the official news agency IRNA that, sometime in the near future, "we calculate that we are going to see the price of oil at between 120 dollars and 150 dollars a barrel" -- up to 50 per cent more than today's price.