"Two individuals did not agree to it without the presence of a witness," a UN statement said.
"
I could rattle off
at least a dozen [names of states which would back war on Iraq]... and I think that there will be more
"
Colin Powell
A third scientist visited a Baghdad hotel housing inspectors on Saturday but left after 90 minutes without speaking to reporters.
US Secretary of State Colin Powell said America would "patiently" assess the first full report by the UN inspectors due on Monday.
But he added that Washington could count on support from "at least a dozen" governments if it decided to launch a military strike without a fresh UN Security Council resolution.
He was speaking after arriving in Davos, Switzerland, for the World Economic Forum, where he is due to deliver a speech on Sunday.
The US administration has accused Saddam Hussein's regime of threatening scientists who try to give information to the inspectors.
Hundreds of anti-war protesters have gathered in Davos while hundreds more are said to have given up trying to reach the mountain town in the face of stiff security measures.
Police used water cannon and tear gas to drive back demonstrators hoping to catch trains to the resort. the protesters fought back with snowballs.
The BBC's Emma Jane Kirby reports that a few protestors were dressed in monkey suits and wore masks of George Bush and some burnt American flags.
Appeal for time
European Union leaders in Davos have appealed for UN inspectors to be given more time.
KEY DATES
"Obviously there is a consensus that we should give them the necessary time if they ask," said Greek Foreign Minister George Papandreou, whose country holds the EU's rotating presidency.
On Monday, the UN Security Council will hear the first formal report on the situation in Iraq from the chief UN weapons inspector, Hans Blix. His team has been searching sites in the country for weapons of mass destruction.
Mr Powell made it clear the Bush administration would not rush to make a decision after Monday's report.
"We certainly will patiently examine the report, consult with our friends and allies," he said.
The inspectors say they need several months to look for the remaining weapons of mass destruction the US says Iraq possesses.
Air assault
At Davos Mr Powell met the Turkish Prime Minister, Abdullah Gul, who said no decision had been made on whether to allow the US to use Turkish bases in any attack on Iraq.
According to America's CBS news, US military planners are preparing devastating air strikes which would leave Iraqi soldiers unable or unwilling to fight.
On the first day of the planned operation US forces would launch up to 400 cruise missiles at Iraqi targets - more than the number fired during the entire 1991 Gulf War, it reported.
The speaker of the Iraqi parliament, Saadoun Hammadi, said on Saturday that his country would use "every method to inflict damage and casualties" against invaders.
Speaking on a visit to India, he did not elaborate.