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.

The presence of U.S. Navy Adm. Brad Cooper, in his dress uniform at the talks in Muscat, the Omani capital, served as a reminder that the aircraft carrier USS Abraham Lincoln and other warships were now off the coast of Iran in the Arabian Sea.

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.

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.

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.

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.

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.