Yemeni security officials say Saudi-led airstrikes and shelling by Shiite rebels have killed nine civilians.

They said five civilians were killed Thursday when airstrikes targeted Shiite rebels, also known as Houthis, in a market in the northern province of Jawf. At least four civilians were killed when the Houthis shelled a residential area in the southern port city of Aden.

Airstrikes hit rebel positions in the southern city of Ataq, the northern rebel stronghold Saada, and Lahj, one of the gateways to Aden.

Officials spoke on condition of anonymity because they were not authorized to speak to the press.

The fighting in Yemen, the Arab world's poorest country, has killed more than 1,000 civilians and displaced more than a million people.