The announcement comes as Iran’s nuclear deal with world powers is unraveling.
The report comes just days after an oil tanker based in the United Arab Emirates disappeared off trackers in Iranian territorial waters.
Tehran said Sunday that it will raise its uranium enrichment level beyond the 3.67% limit set in the 2015 nuclear deal.
It's a major departure from the 2015 nuclear deal, a year after the U.S. unilaterally withdrew from the accord.
The measures target Iranian Supreme Leader Ayatollah Ali Khamenei and his office.
President Donald Trump said he was imposing more sanctions but still wanted to strike a deal to ease tensions with Iran.
At the root of the recent spike in tensions appears to be Trump’s decision a year ago to pull out of the nuclear deal.
A lack of congressional oversight is leaving the Trump administration on a collision course with Tehran.
Marzieh Hashemi is being held in prison, apparently as a material witness, her son said.
The attempts to break in to emails of U.S. Treasury officials, Arab atomic scientists and D.C. think-tank employees illustrate Tehran's espionage priorities.
It's the bloodiest assault to strike the country in recent years.
The International Atomic Energy Agency said Tehran has been cooperating with inspectors and limiting stockpiles of key nuclear materials.
A senior Iranian military commander poured scorn on U.S. threats to tighten sanctions.
“We have to preserve this agreement so we don’t have to negotiate a new agreement,” the EU's energy chief said.
The Morning Email: “It is obvious that Trump only understands the language of force.”
The Aseman Airlines flight crashed near the town of Semirom, roughly 370 miles south of Tehran.