Rebel-run satellite television said two strikes hit the Red Sea island of Kamaran and a third targeted Qanawis, north of Hodeida port. Reports also cited strikes in Jawf. The rebels said they downed a Saudi drone over Saada, a Houthi stronghold.
The strikes came hours after loud explosions were heard in Riyadh, which has taken intense fire for several days. Houthi forces have repeatedly attacked King Khalid International Airport there. Saturday's attack was the deadliest in the country in over a decade.
Saudi Arabia is the world's top oil exporter, and the attacks have greatly hampered its ability to get oil to market. The International Monetary Fund estimates the Saudi economy will contract 3.3% this year as a result. The Houthis have fought the kingdom since 2015, when it joined Yemen's civil war to lead a military coalition against them. The recent surge ties to the US-Israeli war on Iran, launched February 28. Egypt's Foreign Minister Badr Abdelatty told Iranian counterpart Abbas Araghchi there is "no justification for these attacks and they cannot be accepted."
Saudi officials have stopped warning of Houthi attacks to calm fears, even as the sirens keep sounding in the capital.