Saudi forces on Saturday intercepted and destroyed a ballistic missile near Riyadh international airport,
Saudi Crown Prince Mohammed bin Salman accused Iran on Tuesday of "direct military aggression" against the kingdom by supplying Yemen's Houthi rebels with ballistic missiles, state media reported.
"The involvement of Iran in supplying missiles to the Houthis is a direct military aggression by the Iranian regime," the Saudi Press Agency quoted the crown prince as saying during a telephone conversation with British Foreign Secretary Boris Johnson.
This "could be considered as an act of war," Prince Mohammed said.
Saudi forces on Saturday intercepted and destroyed a ballistic missile near Riyadh international airport, reportedly fired from Yemen by the Huthi rebels.
It was the first reported Houthi missile launch to reach Riyadh and threaten air traffic, underscoring the growing threat posed by the conflict on Saudi Arabia's southern border.
Riyadh accused Tehran of supplying ballistic missiles to the Huthi rebels. Iran denied the allegation.
Tensions have been rising between Sunni-ruled Saudi Arabia and predominantly Shiite Iran, which back opposing sides in wars and power struggles from Yemen to Syria.
On Monday, the Saudi-led military coalition in Yemen said it reserved the "right to respond" to the missile attack on Riyadh, calling it a "blatant military aggression by the Iranian regime which may amount to an act of war".