US Treasury Secretary Scott Bassan has left his home and moved to a military base after threats on his life from Iran, the New York Times reports. It is unclear how serious the threats were.
Earlier, a senior US intelligence official warned that Tehran's plans to carry out attacks on US citizens had reached an advanced stage. However, American officials see Iran's ability to carry out large-scale attacks abroad as limited.
Bassan leads Washington's campaign of economic pressure on Tehran.