The Iranian government says it has affirmation that one of its nuclear scientists was abducted and is actuality captivated in the US adjoin his will.
Shahram Amiri abolished a year ago while on a crusade to Saudi Arabia.
A video advertisement by Iranian TV purports to appearance Mr Amiri adage he was kidnapped and is active in Arizona.
Hours later, addition video acquaint on YouTube appeared to appearance the scientist adage he was blessed in America. The US denied abducting him.
The adverse accounts of Mr Amiri's fate accept emerged as the UN Aegis Council is due to vote on a fourth annular of sanctions adjoin Iran over its nuclear programme on Wednesday.
Mr Amiri formed as a researcher at a university in Tehran, Iranian media reported.
But added letters said he formed for the country's Atomic Energy Organisation and had all-embracing ability of the country's nuclear programme.
In the video apparent on the Islamic Republic of Iran Broadcasting network, the man says he was affected to say he defected with a laptop abounding of affirmation about Iran's nuclear secrets and that he was actuality acclimated to put burden on Iran.
The video showed a man cutting headphones and talking to his webcam.
He says he was in the Saudi burghal of Medina as allotment of a Muslim crusade back Saudi intelligence admiral benumbed and kidnapped him.
"When I became conscious, I begin myself in a even on the way to the US," he said.
"Since I was abducted and brought to the US I was heavily bent and pressured by US intelligence."
The man says in the blur that the recording was fabricated on 5 April in the burghal of Tucson, Arizona.
Iranian TV letters said the Iranian aegis casework acquired the blur "by appropriate methods" but did not elaborate.
On Monday the blow was acquaint on to YouTube.
Responding to the accusation on Tuesday, accompaniment administration agent Philip Crowley told reporters: "Did the United States kidnap [Mr Amiri] from Saudi Arabia? The acknowledgment is No."
In the additional clip, acquaint hours after to a YouTube annual in the name of Shahramamiri2010, the man says he lives cautiously in the burghal and wants to abide his apprenticeship in the US.
"I am chargeless actuality and I assure anybody I am safe," he said in Farsi.
"My purpose in today's chat is to put an end to all the rumours that accept been levelled at me over the accomplished year. I am Iranian and I accept not taken any accomplish adjoin my homeland."
In March US account approach ABC ran a address commendation bearding US admiral that said Mr Amiri had defected and was allowance the US abridge intelligence on Iran's nuclear weapons programme.
They appropriate that he had accustomed them admired advice about the Iranian nuclear programme, including the afresh appear centrifuge accessory bulb alfresco the burghal of Qom.
The abstruse bulb was appear in September aftermost year, aloof canicule afore a affair in Geneva amid Iran and the abiding bristles associates of the UN Aegis Council.
The US and its allies accept Iran is aggravating to access a nuclear weapon, but Tehran denies the charge.
