The U.S. Treasury announced sanctions on Faysal al-Zahrani, Husayn Juaythini and Turki al-Binali last week.
Iranians will still be allowed to visit Saudi Arabia on pilgrimage, according to the Saudi foreign minister.
UN children's agency calls on all parties in conflict to ensure safety of children.
Iranian-allied Houthis besiege Yemeni president's base as Saudi Arabia deploys a reported 150,000 troops and 100 warplanes.
Arab-Gulf oil ministers want media to present policy in a positive way after oil price coverage.
A coalition of five Arab nations joined the U.S.
The marchers are trying to highlight their demands two days before an annual Formula One race