An aid organisation & Houthis also claim dozens have been killed in Saudi-led air strikes in Yemen
Two pilots in the Saudi-led coalition fighting in Yemen were killed when their Apache helicopter came down on the Saudi-Yemen border on Friday, the coalition said.
In a statement carried by the official Saudi Press Agency, the coalition said it was investigating the cause of the crash, which took place in Saudi Arabia's border province of Jizan.
Yemen's Saba news agency, run by the Houthi movement, said Houthi forces had shot down a Saudi Apache helicopter in Jizan.
The coalition named the two pilots as Ali Bin Mohammed Al Qarni and Nasser bin Mohammed Al Harthy.
Meanwhile, Medicins Sans Frontieres and the Houthis also claim dozens of people, many of them civilians, were killed in air strikes by a Saudi-led coalition on the southwestern Yemeni city of Taiz.
Houses were reduced to rubble and many victims were unable to reach hospitals, Medicins Sans Frontieres said on Friday.
Saba news agency, which is run by the Houthi movement, said the air raids late on Thursday targeted Taiz's palace and the Sala neighborhood, which has a dense Houhti population.
Taiz has become the latest focus of fighting for supporters of President Abd-Rabbu Mansour Hadi, who was driven into exile in Saudi Arabia by Houthi fighters in March. Yemen's third-largest city, it is considered its cultural capital.
The Saudi-led Gulf Arab coalition intervened on the side of Hadi loyalists in March. They have pushed back Houthi forces who had taken control of most of the country but the civilian death toll has drawn growing criticism from international aid and rights groups.
Medicins Sans Frontieres put the toll from Thursday's raids at as a high as 65, including at least 17 children and 20 women. A Health Ministry spokesman, Tamim Al Shami, later confirmed at least 65 dead and 50 wounded.
"Those who survived the bombings are searching through the rubble with their bare hands in the hope of finding survivors, as well as the bodies of victims of the attack," Salah Dongu'du, Medicins Sans Frontieres project coordinator in Taiz, said in a statement.
Medical sources said Houthi attacks in the city killed 13 people, including seven children.
There was no immediate comment from officials from the Saudi-led coalition.
Dongu'du said patients and Medicins Sans Frontier staff were unable to reach hospitals due to the heavy fighting and airstrikes.
He told Reuters that this was the first time that Sala had been hit but he expected bad days lay ahead. Many people had sought refuge there in previous days after fleeing form more dangerous parts of the city, he said.
Local officials told Reuters that Houthi fighters fired mortars at Taiz's Asifrah neighbourhood and al-Masbah, east of the city, in a bid to drive out Hadi supporters. The barrages destroyed a power plant in the city.
Gains by the pro-Hadi forces have put them in control of parts of the city.
In other developments, two pilots in the Saudi-led coalition were killed when their Apache helicopter came down on the border with Yemen on Friday, the coalition said.
The cause of the crash, which took place in Saudi Arabia's border province of Jizan, was being investigated.
Saba said Houthi forces had shot down a Saudi Apache helicopter in Jizan.
The southern port city of Aden was retaken from the Houthis last month with the help of coalition air strikes and weapons deliveries. The Houthis, a Shi'ite Muslim sect traditionally based in Yemen's north, still hold the capital Sanaa, which they seized last September.
The civil war has killed more than 4,300 people and caused a humanitarian crisis. Diplomats and air groups have appealed for a ceasefire.
Saudi Arabia sees the Houthis as proxies for Iran, its rival for regional leadership. The Houthi movement says it is trying to root out corruption and defeat Islamist militants linked to al Qaeda.For all the latest transport news from the UAE and Gulf countries, follow us on Twitter and Linkedin, like us on Facebook and subscribe to our YouTube page, which is updated daily.