"The uranium is the wild card in that situation," one officer said.
An attempt by the European Union to keep Iran in compliance with a 2015 nuclear deal may have fallen short.
Piketon, Ohio, residents suggested a nearby gaseous diffusion plant might be responsible for the uranium.
A spokesman for the country's Atomic Energy Organization said Iran could resume its 20 percent uranium enrichment in under two days.
A spokesman for Hillary Clinton said the allegations are a distraction from the probe into Russian collusion in the 2016 election.
The very existence of the Havasupai tribe is at risk.
Its atomic energy spokesman said Iran would "take first retaliatory action immediately."
Saudi Arabia's former intelligence chief, Prince Turki al-Faisal, said the country would not give up its "sovereign" right to a civilian nuclear program.
Take a look at the Wall-E of Fukushima.
Republican lawmaker says Mueller "must step down immediately" because of ties to the Obama administration.
The head of Iran's Atomic Energy Organization warned of the country's capabilities amid mounting rhetoric between Tehran and Washington over the 2015 nuclear deal.
The Justice Department confirmed that the informant had been released from a confidentiality agreement.
The plan, code-named Nitro Zeus, was aimed at damaging Iran's air defenses, communications and power grid.
The country is believed to be working toward developing an intercontinental ballistic missile that can hit targets in the mainland U.S..
The increase in uranium production could be used to expand its stockpile of nuclear weapons, an expert suggested.
Making nuclear fuel safer and more efficient by revisiting a Cold War–era discovery.
Leading professor who studied the village for four years is concerned that the unidentified illness may escalate.