Saudi Arabia claims to have intercepted three missiles fired from neighboring Yemen.
The Saudi Arabia-led coalition fighting the Houthi rebels in Yemen said it had intercepted "three booby-trapped drones" in addition to the missiles.
The missiles were targeting the cities of Najran and Dschasan in the south and an undisclosed location in the east of the country, which is important for the oil industry.
Just last week, eight people were injured in a drone attack on Abha Airport in southern Saudi Arabia.
The military coalition then blamed the Houthi rebels for the attack.
Tens of thousands of people have already been killed in the conflict
War has been raging in Yemen since 2015 between the troops of President Abd Rabbo Mansur Hadi, backed by Saudi Arabia and other Arab states, and the Houthi rebels, which Iran is behind.
Tens of thousands of people were killed and millions of residents had to flee.
The United Nations classifies the situation in Yemen as the worst humanitarian crisis in the world.
While the United Nations campaigns for an end to the war, the Houthis are calling for the reopening of the airport in Sanaa, which Saudi Arabia has been blocking since 2016. Before that, the Houthis do not want to agree to a ceasefire or negotiations. The new UN special envoy for Yemen, the Swedish diplomat Hans Grundberg, is due to take up his post on Sunday.