The fighter jest serving with the Royal Saudi Air Force launched the assaults on Sa’ada Province on Saturday and Friday, Yemen’s Houthi fighters said on their website.

The aircraft released as many as 115 missiles, added the statement, which said four civilians including a child had been killed in attacks on the northern Malahit and Saqain districts.

The Nearly one-million population of the northwestern province has been caught in a fierce state-led and Saudi-aided crackdown on the Houthis. Besides incurring civilian casualties, the attacks have forced tens of thousands to flee their homes.

The Saudis have recently reinforced Sana’a’s offensive against the Houthis, charging that the fighters had attacked one of its border checkpoints.

Already involved in defending the Shia minority from Yemeni soldiers, the fighters deny the charge saying they could not possibly be interested in opening another front.

The Saudi forces, fighters claim, venture beyond Houthi positions targeting the civilian areas and using unconventional weaponry including flesh-eating white phosphorus bombs.

The two governments have also blocked the shipment of humanitarian aid into the under-siege territory.

The international rights body, Human Rights Watch recently made an urgent call on the invading parties to spare the non-combatants and ensure they receive humanitarian assistance. James Ross, legal and policy director at Human Rights Watch said on Monday that “the escalating conflict in northern Yemen risks escalating civilian casualties.”