Yemen's government said Houthis fired six ballistic missiles at the Red Sea port of Mocha on Friday, killing at least four civilians.
The escalation in hostilities between the Houthis and the government has come amid heightened regional tensions from the US-Israeli war on Iran.
The Houthis have emerged as a key front in that war, raising the prospect of a return to large-scale conflict in Yemen.
The Yemeni armed forces said in a statement that the Houthi attack on Mocha targeted a civilian facility and economic and maritime installations, killing one port security guard.
Two sailors were also missing, and eight civilians were wounded, the armed forces said.
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