Iranian Foreign Minister Mohammad Javad Zarif has accused Saudi Arabia of using its escalating diplomatic row with Tehran to derail peace talks on the Syrian conflict.
The Sunni Arab monarchies of the Persian Gulf have expressed support for Saudi Arabia in its diplomatic row with Iran, condemning what they described as Iranian interference in Riyadh's internal affairs.
Executives from 25 news organizations urged U.S. Secretary of State John Kerry to press for the release of a Washington Post reporter jailed in Tehran.
Iran accused Saudi Arabia of "sectarian hate-mongering" and said the kingdom must choose between promoting extremism and fostering good relations in the Middle East.
Hila Sedighi, a popular Iranian poet who had in the past criticized state repression and campaigned for an opposition presidential candidate, has been detained by authorities, relatives said.
Thousands of Iranians held anti-Saudi protests across the country on January 8 condemning Riyadh's execution of a prominent Shi'ite cleric that has sparked renewed tensions between the two regional rivals.
Iranian Princess Ashraf Pahlavi, the twin sister of the last shah of Iran, has died at the age of 96.
A Republican bill to increase U.S. congressional oversight of the Iran nuclear deal cleared a key committee on January 7 and is headed for a vote in the full House next week.
The rising tensions between Tehran and Riyadh have reached into the sports arena, with the Saudi soccer federation citing security concerns for saying it will not participate in matches in Iran.
U.S. Secretary of State John Kerry has said a comprehensive nuclear deal between Iran and world powers may be "days away from implementation, if all goes well."
Pakistani Prime Minister Nawaz Sharif has expressed "deep concern" about the growing rift between Iran and Saudi Arabia and called on the two nations to peacefully resolve their differences.
As Iranian-Saudi tensions soar over Riyadh's execution of a prominent Shi'ite cleric, here's a sample of how Iran and Saudi Arabia see each other -- in cartoons.