A session of the Iranian National Assembly (Source: AFP/VNA)

Trump warned that Iran would face “new and serious consequences” unless all detained Americans were released and returned.

Iran has recently sentenced a 37-year-old researcher at Princeton University 10 years in prison for "infiltration" in Iran.

The US on Tuesday imposed a new set of economic sanctions on Iran for its ballistic missile program and alledged support for terrorist groups in the Middle East. Washington and Tehran severed diplomatic relations in 1980 in the wake of the Islamic revolution.