The US has announced a reward of up to $20 million for information about Iran's nuclear programme, BBC reports.
The State Department's Rewards for Justice is also offering to potentially relocate the person who provides such details.
President Donald Trump claimed last year that Iran's nuclear facilities had been "completely and totally obliterated" following a bombing campaign by the US and Israel.
Iran insists its nuclear programme is peaceful and that it has no intention of developing a nuclear weapon.
Meanwhile, the US military says it is setting up a task force to enhance Washington's efforts to restrict Iran's movement of weapons and sanctioned material across its borders.
The US military's Central Command (Centcom) said Task Force Iron Gate would operate from Tampa, Florida, and would work with other US government agencies.
As well as the movement of weapons, it will also focus on dual-use and illegal revenue streams.
Centcom estimates that its naval blockade of Iran's ports has prevented the country from exporting more than $25bn in crude oil.
