USS John C Stennis is being deployed to the Persian Gulf
US contingency plans for air strikes on Iran extend beyond nuclear sites and include most of the country's military infrastructure, the BBC has learned.
It is understood that any such attack - if ordered - would target Iranian air bases, naval bases, missile facilities and command-and-control centres.
The US insists it is not planning to attack, and is trying to persuade Tehran to stop uranium enrichment.
The UN has urged Iran to stop the programme or face economic sanctions.
But diplomatic sources have told the BBC that as a fallback plan, senior officials at Central Command in Florida have already selected their target sets inside Iran.
BBC security correspondent Frank Gardner says the trigger for such an attack reportedly includes any confirmation that Iran was developing a nuclear weapon - which it denies.
Alternatively, our correspondent adds, a high-casualty attack on US forces in neighbouring Iraq could also trigger a bombing campaign if it were traced directly back to Tehran.
Deadline
Earlier this month US officials said they had evidence Iran was providing weapons to Iraqi Shia militias. At the time, Iranian President Mahmoud Ahmadinejad said the accusations were "excuses to prolong the stay" of US forces in Iraq.
Middle East analysts have recently voiced their fears of catastrophic consequences for any such US attack on Iran.
Britain's previous ambassador to Tehran, Sir Richard Dalton, told the BBC it would backfire badly by probably encouraging the Iranian government to develop a nuclear weapon in the long term.
Last year Iran resumed uranium enrichment - a process that can make fuel for power stations or, if greatly enriched, material for a nuclear bomb.
Tehran insists its programme is for civil use only, but Western countries suspect Iran is trying to build nuclear weapons.
The UN Security Council has called on Iran must suspend its enrichment of uranium by 21 February.
If it does not, and if the International Atomic Energy Agency confirms this, the resolution says that further economic sanctions will be considered.
US contingency plans for air strikes on Iran extend beyond nuclear sites and include most of the country's military infrastructure, the BBC has learned.
It is understood that any such attack - if ordered - would target Iranian air bases, naval bases, missile facilities and command-and-control centres.
The US insists it is not planning to attack, and is trying to persuade Tehran to stop uranium enrichment.
The UN has urged Iran to stop the programme or face economic sanctions.
But diplomatic sources have told the BBC that as a fallback plan, senior officials at Central Command in Florida have already selected their target sets inside Iran.
BBC security correspondent Frank Gardner says the trigger for such an attack reportedly includes any confirmation that Iran was developing a nuclear weapon - which it denies.
Alternatively, our correspondent adds, a high-casualty attack on US forces in neighbouring Iraq could also trigger a bombing campaign if it were traced directly back to Tehran.
Deadline
Earlier this month US officials said they had evidence Iran was providing weapons to Iraqi Shia militias. At the time, Iranian President Mahmoud Ahmadinejad said the accusations were "excuses to prolong the stay" of US forces in Iraq.
Middle East analysts have recently voiced their fears of catastrophic consequences for any such US attack on Iran.
Britain's previous ambassador to Tehran, Sir Richard Dalton, told the BBC it would backfire badly by probably encouraging the Iranian government to develop a nuclear weapon in the long term.
Last year Iran resumed uranium enrichment - a process that can make fuel for power stations or, if greatly enriched, material for a nuclear bomb.
Tehran insists its programme is for civil use only, but Western countries suspect Iran is trying to build nuclear weapons.
The UN Security Council has called on Iran must suspend its enrichment of uranium by 21 February.
If it does not, and if the International Atomic Energy Agency confirms this, the resolution says that further economic sanctions will be considered.
