Yemen’s Iran-aligned Houthis have attacked Saudi Aramco’s Jazan refinery, they said on Sunday, two days after the kingdom signed a defense pact with Turkey and Pakistan in response to growing regional instability from the U.S.-Israeli war on Iran.

The ⁠alliance with Sunni Muslim U.S. allies, Turkey and Pakistan, is intended to strengthen collective deterrence against any act of aggression and stipulates that an armed attack against any of the three would be regarded as an attack on all.

It was not clear whether or how either Pakistan or Turkey would join in any Saudi response to the latest attacks.

The Houthis declared a naval blockade against Saudi Arabia in ⁠the Red Sea last month, citing what they said was a ​Saudi siege ⁠on them, an allegation Riyadh denies.

The Saudi Energy Ministry said a fire had broken out at the refinery but was later extinguished with no injuries and authorities were dealing with the incident, without giving ⁠a cause.

The Houthis used a drone to target the refinery, military spokesperson Yahya Saree posted on X. They had struck ​Aramco sites before ⁠in Jazan, which processes 400,000 barrels of crude ‌oil per day in southwestern Saudi Arabia. They had also hit Yanbu on the Red Sea.

In a separate statement, Saree said the Houthis carried out missile and drone strikes on the Yemeni Red Sea port city of Mocha. The historic ‌port is controlled by the Aden-based government, which is internationally recognized and ‌backed by Riyadh.

Three Yemeni government sources told Reuters air defenses were engaging drones launched by the Houthis toward the commercial quay and storage in the port. They did not specify they were Saudi air defenses.

Saree said the Houthi strikes targeted Saudi troops and weapons arsenal in ⁠the area. There was no Saudi comment on the attacks in Yemen.

The Yemeni military spokesperson said the attack on the port killed seven people.

The Yemeni transportation ministry said in a statement that the attack caused severe damage to the port’s infrastructure.

“This marks yet another assault on a vital civilian facility that serves citizens and contributes to boosting commercial and maritime activity in the Red Sea,” the ministry said. Iran and its allied Shia Muslim armed groups have been firing on Saudi Arabia and other Gulf states and blockading their energy shipments since the U.S. and Israel attacked the country on Feb. 28 in ‌a major escalation after years of regional tumult. Talks have dragged on between the U.S. and Iran in ​pursuit of a peace deal, with access to the Strait of Hormuz, a major conduit for energy supplies, ‌proving a major stumbling block.

Houthi attacks in the Red ⁠Sea have aggravated the disruptions of supplies to global markets.

Turkish Foreign Minister Hakan Fidan said on Friday, ⁠as the alliance was announced, that it was not directed against Iran or any other country, but rather served as a general pledge to support the three ‌allies’ security.

Fidan said the allies ​would decide through consultations what degree, form and format of support ‌they would ask for in the event of an ​attack on any of them.