Iran demands US frees Iranian citizens following Trump rebuke

"America should quickly release Iranian prisoners in the country," foreign ministry spokesman Bahram Qassemi said, according to the Iranian Students' News Agency (ISNA).

On Friday, Trump urged Tehran to return Robert Levinson, an American former law enforcement officer who disappeared in Iran more than a decade ago, and to release businessman Siamak Namazi and his father, Baquer, both jailed on espionage charges.

Trump warned that Iran would face "new and serious consequences" if the three men were not released. 

The statement capped a week of US rhetoric against Tehran, which announced last Sunday that another US citizen, Xiyue Wang, a graduate student from Princeton University, had been sentenced to 10 years in jail on spying charges.

On Tuesday, Washington slapped new economic sanctions on Iran over its ballistic missile programme and said Tehran's "malign activities" in the Middle East undercut any "positive contributions" coming from the 2015 nuclear accord.

Last October, an Iranian court sentenced 46-year-old Siamak Namazi and his father 80-year-old Baquer Namazi to 10 years in prison on charges of spying and cooperating with the United States.

Iran's Islamic Revolutionary Guard Corps detained Siamak in October 2015 while he was visiting family in Tehran, and Baquer, a former Iranian provincial governor and ex-UNICEF official, in February last year, family members said.

Levinson, a former agent for the FBI and for the Drug Enforcement Administration, disappeared in Iran in 2007. The US government has a $5 million (3.85 million pounds) reward for information leading to his safe return.

Robert Levinson left Iran years ago and the Islamic Republic has no information about his whereabouts, foreign ministry spokesman Qassemi said on Saturday.

"The statements of the White House, as usual, are an example of interference in Iran's internal affairs and the demands are unacceptable and rejected," Qassemi said, according to ISNA.