Iranian parliament Speaker Mohammad Bagher Ghalibaf. AP
"So far, no delegation from Iran has departed for Islamabad, Pakistan; whether it is the main or subsidiary delegation, primary or secondary," state TV said, dismissing reports suggesting otherwise.
It quoted unnamed Iranian officials as saying that taking part in the negotiations "depends on the change in the behaviour and positions of the Americans."
Iran's powerful parliament speaker, Mohammad Bagher Ghalibaf, who led the talks with the US two weeks ago, had said Iran would "not accept negotiations under the shadow of threats."
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