Houthi rebels in Yemen say they have seized large numbers of Saudi troops after a major attack near the border between the two countries.
A Houthi spokesman told the BBC that three Saudi crews had deployed near the Saudi city of Nairan.
He said that thousands of soldiers were captured and many others killed. Saudi officials did not confirm the request.
The operation was the largest of its kind since the conflict began, the spokesman said.
Colonel Yahia Sareya stated that the Saudi forces had suffered "enormous losses in life and machinery".
All captured will be parodied
Hussi claims that unmanned and rocket attacks on Saudi oil facilities have hit September 1
But the Saudis – backed by the US, UK, France and Germany – have all blamed Iran for the strike, Tehran denies.
What is the origin?
Yemen has been at war since 2015, when President Abdrabh Mansour Hadi and his cabinet were forced to flee.
The Coalition launches air strikes almost daily, while the Houthis often launch missiles in Saudi Arabia.
The civil war has caused the worst humanitarian catastrophe in the world, with 80% of the population – more than 24 million people – needing humanitarian assistance or protection, including 10 million who rely on food aid for survival.
More than 70,000 people are estimated to have died since 2016 as a result of the conflict, according to UN estimates.