Saudi Arabia's powerful crown prince accused Iran on Tuesday of "direct military aggression" through Yemen's Huthi rebels, ratcheting up regional tensions as the kingdom reels from a sweeping royal purge.
Sunni-ruled Saudi Arabia and predominantly Shiite Iran have been trading fierce accusations over their involvement in the conflict in Yemen, in which they back opposing sides.
In the latest flare-up, Saudi Arabia on Saturday intercepted and destroyed a ballistic missile near Riyadh international airport, reportedly fired from Yemen by Iran-backed Huthi rebels, provoking a bitter war of words.
Saudi Arabia accused Iran of supplying missiles to the rebels. Tehran vehemently denied the charge and in turn accused Riyadh of war crimes in Yemen.