SANAA - Arab air strikes killed 15 people and wounded dozens across Yemen late on Saturday, the Houthi-run Saba news agency reported.

The dead included five women and two children in attacks on Saada and Marib provinces, the agency said. A Saudi-led Arab coalition has been bombarding Houthi rebels and allied army units since March 26 in a campaign to restore exiled President Abd-Rabbu Mansour Hadi to power. Hadi, Riyadh's ally, was pushed aside last year when Houthis advancing from their northern strongholds overran the government in the capital Sanaa and went on to capture lands to the south.

Anti-Houthi forces said they repelled an attack by Houthi and allies in Yemen's army on the southern city of Dhalea on Sunday, in clashes which left 17 Houthi fighters and two local militiamen dead.

In Aden, four local fighters were killed in a Houthi attack, militia sources said. Residents said Arab forces airdropped artillery equipment including mortar batteries to the anti-Houthi fighters over the weekend. UN-sponsored talks in Geneva between Yemen's warring parties ended on Friday without agreement on a ceasefire, an outcome relief agencies had sought to stave off what many see as a humanitarian disaster.

More than 2,800 people have been killed since March 26. The United Nations says more than 21 million people, or 80 percent of the population, are now estimated to be in need of some form of humanitarian aid, or protection, or both.

A series of coordinated bombings claimed by Islamic State has deepened a sectarian tinge to the conflict.

In the latest attack, Islamic State said it was behind a car bomb that exploded in Yemen's capital Sanaa on Saturday near the Qiba al-Mahdi mosque, killing two people and wounding six.

Meanwhile, rebel shelling of residential areas in Yemen's Aden killed at least three civilians on Sunday, as air strikes by the Saudi-led coalition also hit the southern city, medics and witnesses said.

Rebels fired Katyusha rockets and mortars at residential areas destroying four homes, residents and military sources said.

Medics at Aden's Al-Naqib hospital told AFP that three civilians were killed and four wounded in the shelling.

Coalition air strikes hit rebel positions at entrances to the city as well as at the strategic Al-Anad air base in the nearby city of Lahj, military sources said.

Late on Saturday clashes between rebels and pro-government forces killed 12 fighters from both sides near the base, the sources said. In the town of Daleh to the north, 15 rebels were killed in an overnight ambush by pro-government fighters, local military sources said, adding that two of the attackers had also died.

AFP could not confirm the tolls from the clashes from independent sources and the rebels rarely acknowledge their losses.

The latest violence came after the UN special envoy for Yemen, Ismail Ould Cheikh Ahmed, announced on Friday that talks in Geneva between the warring sides ended without agreement.

The rebels - including Shiite Huthi militiamen and troops loyal to ex-president Ali Abdullah Saleh - have seized control of large parts of Yemen after taking the capital Sanaa last September.

The coalition launched the air strikes in March in support of President Abedrabbo Mansour Hadi, who fled a rebel advance on Aden to Saudi Arabia.

Loyalist troops have been joined by some Sunni tribes and southern separatists in battling the rebels.

More than 2,600 people have been killed in Yemen since March, according to UN figures, and almost 80 percent of the population - 20 million people - are in need of urgent humanitarian aid.

The situation is particularly serious in Aden, where residents have complained of food and water shortages and health officials are warning of the spread of disease.