'Cooler heads prevailed' source tells Reuters, weeks after Mnuchin said new penalties on the foreign minister would be announced in coming days

London says it is 'concerned' after its warship was forced to issue verbal warnings and position itself to prevent action; effort comes after Iranian ship detained in Gibraltar

CNN says 5 Revolutionary Guards gunships try to force the tanker off course and into Iranian waters but fail; effort comes after Iranian ship detained in Gibraltar

US president says Tehran has long been enriching uranium 'in total violation' of nuclear deal, as IAEA meets to discuss Iran breaching the pact's limits

Iran continues to threaten UK over 'mean and wrong' seizure of ship said to be carrying crude to Syria in violation of EU sanctions, says London to blame for insecurity in region

Army head says capture of ship based on 'fabricated excuses,' threatens to respond if necessary

Defense minister calls Britain's seizing of oil tanker off Gibraltar 'piracy,' contrary to international regulations and nuclear deal commitments

Visiting scholar Masoud Soleimani and two other researchers suspected of trying to bring recombinant protein back to Iran

As Tehran set to violate key provision of nuke deal following 60-day ultimatum, Pompeo urges world to clamp down on Islamic Republic

Tehran says port listed as destination in Syria does not have capacity to handle supertanker; end point was actually unnamed third country