JERUSALEM (AP) — Bahrain activated its sirens early Friday, warning residents to shelter from detected fire hours after the U.S. military said it had wrapped up its 13th night of strikes against Iran.The Gulf states have come under frequent fire over the past week as the U.S. and Iran exchange escalating strikes in fighting that began with a struggle over control of the strategic Strait of Hormuz. Iranian state media reported that four people had been killed and nine injured in the bombardment.The previous day, Yemen’s Iran-backed Houthi rebels said they targeted two Saudi oil tankers in the Red Sea, potentially widening the Iran war as international oil topped $100 a barrel.U.S. Central Command said the latest barrage was designed to “further degrade Iran’s ability to threaten civilian mariners and commercial vessels transiting regional waters” as the Americans push to regain control over the Strait of Hormuz, through which a fifth of the world’s oil and gas transited in peacetime. It said the strikes ended shortly before 5 a.m. local time Friday.Prime Minister Ali al-Zaidi of Iraq, which has close ties to both the U.S. and Iran, was in Tehran on Thursday to call for peace and dialogue. He promised not to allow Iraqi territory to be used for attacks on Iran, his office said. Al-Zaidi met with Trump earlier this month in Washington.