The United States has imposed fresh sanctions on 11 Iranian companies and individuals.
The sanctions by the United States is over a recent ballistic missile test, which will prevent the 11 entities and individuals linked to the missile programme from using the US banking system.
The move came after international nuclear sanctions on Iran were lifted as part of a deal hailed by President Barack Obama on Sunday as "smart".
As part of the deal,four American-Iranians were also freed in a prisoner swap. Among the freed American-Iranians are Washington Post reporter Jason Rezaian, whom President Obama described as "courageous". A fifth American by named, Matthew Trevithick,was freed separately in a different process.
Rezaian and two of the others freed flew to a US base in Germany via Geneva for medical evaluation.According to US officials,another victim , Nosratollah Khosravi-Roodsari, did not fly out with the others.
The US said it had offered clemency to seven Iranians being held in the US for sanctions violations.Negotiations in December over the prisoner exchange delayed the US Treasury's imposition of the latest sanctions.
Media reports say they were only announced once the plane containing the former prisoners had left Iran, reports said.