A Qatari national arrested in Yemen on suspicions of working with the Iran-aligned Houthis has been released after more than a year in detention in Saudi Arabia, Qatar's National Human Rights Committee (NHRC) said.

United Nations aid chief Mark Lowcock called out Saudi Arabia and the United Arab Emirates on Thursday for only paying a "modest proportion" of the hundreds of millions of dollars they pledged five months ago to a humanitarian appeal for Yemen.

The increased use of drones by Iran and its allies for surveillance and attacks across the Middle East is raising alarms in Washington.

The U.S. House of Representatives backed resolutions on Wednesday to block the sale of precision-guided munitions to Saudi Arabia and the United Arab Emirates, sending them to the White House, where President Donald Trump has promised a veto.

The Saudi-led coalition fighting in Yemen intercepted and downed three drones launched by the Houthi movement towards the southwestern Saudi cities of Jizan and Abha, state TV reported on Tuesday.

Yemen's warring parties have agreed new measures to enforce a ceasefire and facilitate a troop pullback from the flashpoint port of Hodeidah, the United Nations said on Monday.

The Saudi-led military coalition spokesman said late on Monday that the coalition had intercepted and destroyed a drone launched by Yemen's Houthi group at civil targets in the kingdom, the Saudi Press Agency reported.

The United Arab Emirates had been planning its recent troop drawdown in Yemen for over a year and coordinated its move with key ally Saudi Arabia, a senior Emirati official said on Monday.

Saudi-led military coalition said on Thursday it had intercepted drones launched by Yemen's Houthi group that was targeting Jizan airport, a statement on Saudi state media said.

A drone attack by Yemen's Iran-aligned Houthi movement on Abha Airport in Saudi Arabia early on Tuesday left nine people injured, a Saudi-led coalition statement said.

The Saudi Arabia-led military coalition in Yemen on Wednesday said it intercepted a suspected Houthi drone launched toward the kingdom, the state-run Saudi Press Agency (SPA) reported.

A Yemeni rebel strike targeted a desalination plant in the southwestern Saudi province of Jizan, a Riyadh-led military coalition fighting the rebels said Thursday.

Yemen's Iran-aligned Houthis struck a power station in Saudi Arabia's al-Shuqaiq city, in the southern province of Jizan, with a cruise missile, their Al Masirah TV said on Wednesday, but there was no immediate confirmation from Saudi authorities.

Yemen's Houthi movement and the United Nations have agreed on a mechanism to inspect ships docking at Hodeidah following the group's withdrawal from three Red Sea ports under a U.N.-sponsored deal, a Houthi official and a U.N. source said.

United Nations food chief David Beasley warned on Monday that a phased-suspension of food assistance in Yemen was likely to begin later this week over a diversion of aid and lack of independence in Houthi-controlled areas.

Saudi Arabia's air defence forces intercepted five drones launched by Yemen's Houthis at Abha airport and the city of Khamis Mushait, a Saudi-led coalition spokesman said in a statement released by the Saudi Press Agency early on Friday.

A U.N. mission monitoring a peace deal between warring parties in Yemen's Hodeidah region said on Wednesday it had not detected any Houthi military forces in three key ports since the group withdrew a month ago.

The Saudi-led military coalition vowed to respond firmly to a missile attack by Yemeni Houthi forces on a civilian airport in southern Saudi Arabia on Wednesday that wounded 26 people.

U.S. Republican members of Congress pushed back on Wednesday against President Donald Trump's plan to sell $8 billion in weapons to Saudi Arabia and the United Arab Emirates, saying it was "unfortunate" the administration used an emergency declaration to avoid Congressional review.

Saudi Arabia's air defence forces intercepted two drones launched by Yemen's Houthis and targeting the city of Khamis Mushait, a Saudi led coalition spokesman said in statement released by Saudi Press Agency early on Tuesday.