The Saudi-led coalition struck targets in the Houthi-held Yemeni port of Hodeidah on Saturday following attacks on Saudi ships in the Red Sea.

The Houthis, an Iranian-backed Shiite group that controls large parts of civil war-torn Yemen, announced a naval blockade of Saudi Arabia last week in response to what it called the unjust “siege” of the country.

Coalition spokesman Major General Turki Al-Maliki said in a statement that the strikes targeted military sites used to “threaten commercial vessels.”

According to the Houthi-aligned Al Masirah TV, telecommunications facilities were hit. The broadcaster added that a woman was injured in a strike on Kamaran Island off Yemen’s Red Sea coast.

The group’s political wing condemned the attacks and vowed to meet “escalation with escalation,” according to Anadolu.

The Saudi Defense Ministry says its forces targeted Houthi military sites in Hodeidah Governorate, including sites linked to attacks against commercial ships in the Red Sea. The port of Hodeidah was not targeted, the Saudi MoD said. https://t.co/CaxWZU4byWpic.twitter.com/TTAIOTyHHi

#BREAKING Saudi airstrikes against Hodeidah, Yemen. pic.twitter.com/yWC1wXSnuT

Shortly after the strike on Hodeidah, Saudi Arabia’s industrial city of Jazan was reportedly hit in an apparent Houthi retaliatory attack. Reports said a large fire broke out at a facility operated by the kingdom’s state-run oil company, Aramco.

Fires burn at the ARAMCO oil terminal in Jazan, Saudi Arabia, following a ballistic missile attack by Ansar Allah (Houthis). https://t.co/uoqjJN3W0ypic.twitter.com/6BT4I5kWz5

The Houthis said they targeted two Saudi-owned tankers this week. Riyadh acknowledged that the Encelia caught fire and later said another Saudi vessel, NCC MASA, sustained minor hull damage in a separate attack on Friday.