Bombs fired from territory held by Yemen’s Houthi militia into a Saudi Arabian border town killed five people on Wednesday, Saudi officials said, as the Iran-allied group stepped up an apparent retaliation for weeks of air strikes by a Saudi-led coalition.

Mortar shells and rockets fired into the town of Najran and a village in Jizan province on Tuesday claimed the first Saudi civilian casualties of the conflict, and prompted coalition jets to hit targets in northern Yemeni towns.

The coalition is considering all options, including ground operations, to prevent more such attacks, its spokesman Brigadier General Ahmed Asseri said in a televised interview on al-Arabiya channel. Asseri has said since the start of the campaign that land operations were a possibility. […]