After a round of indirect talks with Trump's envoys in Oman, Iran's top diplomat says the country will keep negotiating, but stresses a lack of trust.

US President Donald Trump warned that Iran’s supreme leader should be “very worried,” as both sides prepare for their first formal negotiations since the United States bombed Tehran’s nuclear program last year.

Satellite images that have shown some recent activity around two Iranian nuclear sites bombed last year by Israel and the U.S. suggest Iran may be trying to recover materials from the area.

Low oil prices give President Donald Trump more leverage over Iran, U.S. Energy Secretary Chris Wright said Friday, speaking as the two adversaries teeter on the brink of another conflict.

Iran seized two oil tankers Thursday while former Iranian minister Ezzatollah Zarghami threatened to make the Strait of Hormuz a "massacre and hell" for U.S. forces.

The BBC World Service has launched a temporary emergency lifeline radio programme for Iran in response to the ongoing turmoil in the country, and the unprecedented crackdown on protests.

Repairs at key missile sites began soon after they were hit by Israeli and U.S. strikes last year, but work at Iran’s nuclear facilities has been slower.