US Secretary of State Hillary Clinton says it could take several months to impose new sanctions on Iran over its nuclear program.
She made the remarks on Monday while speaking to reporters traveling with her on a tour of South America.
Pundits say she changed her position on sanctions because of reluctance among some other members of the UN Security Council.
Last week, Clinton told the US Senate that the UN Security Council would endorse sanctions in the next 30 to 60 days.
But on Monday she stressed that Washington is working "expeditiously and thoroughly" to convince UN Security Council members to impose new sanctions on Iran.
"We are moving expeditiously and thoroughly in the Security Council. I can't give you an exact date, but I would assume sometime in the next several months," she said before landing in the Argentine capital Buenos Aires.
Clinton said she would probably discuss the Iranian issue during talks with the presidents of Argentina and Brazil.
Last week, Clinton acknowledged that some key countries like China are opposed to new Iran sanctions.
Both China and Russia are calling for further negotiations to resolve the dispute over Iran's nuclear program, which Tehran says is being implemented to meet the country's growing demand for energy.
/Press TV/