The UN chief weapons inspector, Hans Blix, has said "loose ends" must be sorted out with Iraq before arms inspections resume.
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It would be awkward if we were doing inspections and a new mandate were to arrive
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Hans Blix
Mr Blix was speaking after briefing the UN Security Council on his talks with Iraqi officials in Vienna on Tuesday.
"There are minor matters and some loose ends that need to be solved before we go to Baghdad," he said.
British and American officials had been readying themselves for a diplomatic offensive to block any early return for weapons inspectors, but in the end they did not even have to argue their case.
Change of plan
The United States and Britain want a robust new UN resolution carrying a clear threat of military action if Iraq fails to meet its obligations.
Mr Blix said the inspectors might delay their return to Iraq pending new instructions from the Security Council .
"It would be awkward if we were doing inspections and a new mandate were to arrive," he said.
He had earlier intended to send some advance teams to Iraq in about two
weeks' time.
Mr Blix told the Security Council that the outstanding issues concerned:
inspectors' access to President Saddam Hussein's palaces
assurances that Iraqi officials would not hamper inspectors' attempts to interview individuals inside Iraq
Iraq's failure to give firm assurances about the safety of UN inspectors while they fly around the country.
The BBC's correspondent at the UN, Greg Barrow, says clarity will only come in the form of a new UN resolution and as it stands, Council members are still divided on what that should contain.
China, France and Russia want to get the inspections started as soon as possible and have resisted the US and British drive for a tough new UN resolution.
US draft resolution for UN
A UN member state can use "all necessary means" should Baghdad not co-operate with inspectors
Any permanent member of the Security Council can join an inspection mission and recommend sites to be inspected
Inspectors can declare no-fly and no-drive exclusion zones anywhere in Iraq
Access to all sites including presidential palaces
Russian Deputy Foreign Minister Alexander Saltanov said on Thursday that Moscow opposed any mention in the draft resolution of the automatic use of force should Iraq fail to comply completely with weapons inspectors.
Mr Blix is expected to meet US Government officials in Washington on Friday.
The BBC's Washington correspondent Justin Webb says that now the return of inspectors is effectively blocked the US intends to continue applying pressure for a new resolution.
Our correspondent says there are signs that the Bush administration may be preparing a tactical compromise involving acceptance of a French plan which allows for two resolutions.
Under the French plan the second resolution sanctioning force would only be passed if the inspectors' work were hampered.
Tough message
The UK Prime Minister, Tony Blair, told the BBC on Thursday that the existing weapons inspections regime had not been tough enough to get the job done.
"The harder the international community is at the moment, the clearer the message we send, the greater the likelihood there is of avoiding conflict," he said.
Mr Blair insisted that toppling Saddam Hussein was not his aim, but said such a result would be "fantastic... not least for the Iraqi people".
Instead, he said that the aim was to disarm the Iraqi leader of his weapons of mass destruction.
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