The Saudi-led coalition, which has been fighting the Iran-aligned Houthi rebels in Yemen, said it will respond firmly to the projectile attack targeting an airport in the kingdom's south-west.
As the Saudi-led coalition prepares to attack the port of Hudaida, Saudi-backed forces on the ground say they cannot guarantee what would happen to the trapped civilians.
The statement from Saudi-led Arab military coalition comes a day after an air strike in Yemeni capital that killed 14 civilians.
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