"'Outrageous' = the US denying simple fact that there IS an agreed deal on the matter of the detainees. Even on how to announce it," Saeed Khatibzadeh said in a tweet.
"Humanitarian swap was agreed with US & UK in Vienna-separate from JCPOA (the Joint Comprehensive Plan of Action)- on release of 10 prisoners on all sides. Iran is ready to proceed TODAY."
The United States on Saturday accused Tehran of an "outrageous" effort to deflect blame for the impasse in the nuclear talks and denied that any deal had been reached on a prisoner swap.