U.S. President Donald Trump warned that Iran would face "new and serious consequences" unless all unjustly detained American citizens were released and returned, the White House said in a statement, Reuters reports.
Trump urged Iran to return Robert Levinson, an American former law enforcement officer who disappeared more than 10 years ago in Iran, and demanded that Tehran release businessman Siamak Namazi and his father, Baquer.
"Iran is responsible for the care and wellbeing of every United States citizen in its custody," the White House said in the statement.