Yemen’s Iran-aligned Houthis launched a new attack on Saudi Arabia on Monday and Gulf Arab states postponed planned talks with Iran, raising concerns the Middle East conflict could spread further and threaten global oil supplies.

The Houthis on Monday said they fired dozens of missiles and drones at a military airbase in Khamis Mushait in southern Saudi Arabia, targeting aircraft hangars, radar systems, runways and ammunition depots in retaliation for Saudi airstrikes in Yemen.

Saudi authorities issued emergency alerts there and in three other southern cities.