Despite lackluster response from Tehran, the US is following a two-track approach on the nuclear issue and is still open to dialogue with Iran on it, a top Obama administration official said on Wednesday.
"The approach that we have been following all along is the two-track approach, and we will continue down the two-track approach," the State Department Acting Spokesman, Gordon Duguid, said.
If Iran is trying to engage in talks with the IAEA on the proposals that are on the table, the US welcomes that.
"We encourage that. That is what is on offer. There are no new offers out there as some press reports may have indicated. There is a willingness on our part to engage on international efforts to provide medical isotopes, which is what the Iranians say that they are looking for," he said.
"But our offer on Iran's nuclear programme remains the same as it has been for months now, and the ball is in Iran's court to go to the IAEA and accept that and then act on it.
And then the IAEA will let us know that that's what they have done," Duguid said.
America's growing concern is that what Iran says that it wants is not actually the case, he noted.
"And this is certainly some of the statements that Secretary (of State, Hillary) Clinton has made over the weekend, as indicating that Iran is saying one thing but doing quite another," he said.