Wadi ad-Dawasir - Portuguese motorbike rider Paulo Goncalves has died after a crash in the Dakar Rally on Sunday, the 40-year-old becoming the gruelling motorsport marathon's 25th fatality.
Goncalves suffered the fatal accident after 276km of the seventh stage from Riyadh to Wadi ad-Dawasir.
"The organisers received an alert at 10:08 and dispatched a medical helicopter that reached the biker at 10:16 and found him unconscious after going into cardiac arrest," a statement on the rally's official website reported.
"Following resuscitation efforts in situ, the competitor was taken by helicopter to Layla Hospital, where he was sadly pronounced dead," it added.
Dakar director David Castera revealed it was Australian defending bike champion Toby Price who was the first to discover the stricken Goncalves lying on the sand.
Goncalves was competing in his 13th edition of the Dakar. He made his debut in 2006 when it was staged in Africa, and took second to Marc Coma in 2015 in South America.
"Paulo was someone who had been around for a long time, who we all knew, who was a feature of the rally," Castera said.
"So this is a very difficult time."
The Indian-backed Hero Motosports rider only made it to this year's first Dakar staged in Saudi Arabia after recovering from a ruptured spleen in a crash in his native Portugal in December.
Following surgery he said before the rally got underway: "It's a victory for me to be here at the start."
Goncalves was placed 46th in the overall bike standings after Friday's sixth stage.
His death cast a pall over the seventh stage action won by Carlos Sainz in a Mini.
The last Dakar competitor to be killed was Polish rider Michal Hernik in 2015 in Argentina.
With 20 of the 25 Dakar deaths since the inaugural edition in 1979 made up of bike riders Castera dwelt on the risks faced by riders.
"We know that bikes are dangerous.
"You set off in the morning, you have a knot in your stomach sometimes because you don't have any protection, you have nothing.
"They all know that, these riders," said Castera, a veteran of five Dakars on a motorbike.
Stephane Peterhansel, who counts six bike wins amongst his 13 Dakar titles, reflected: "I always felt I was playing with fire on a bike, I ended my bike career very young and saw friends die in front of me."
The Frenchman added: "When we passed (the scene of the accident) I had a really bad feeling. When you see all the medical officers busy, a survival blanket over the rider, you know something terrible has happened."
Portuguese President Marcelo Rebelo de Sousa in an official statement said Goncalves had died "attempting to accomplish the dream of winning one of the most dangerous and toughest rallies in the world".
He described him as "a highly distinguished" sporting ambassador for Portugal while Portuguese MotoGP rider Miguel Oliveira paid tribute to Goncalves' "courage and bravery".
Two-time former Formula One champion Fernando Alonso, making his Dakar debut, commented: "This sport is extreme... mechanical sports can never be 100 percent safe."
Monday's motorcycle action on the eighth stage in and around Wadi ad-Dawasir was cancelled "in order to give the riders time to mourn their friend," said organisers.
On a sombre day in the desert Sainz tightened his grip on the overall car standings with his third stage win of this year's edition.
The 57-year-old Spaniard in a Mini completed the longest special between Riyadh and Wadi ad-Dawasir over two minutes clear of Toyota rival Nasser Al-Attiyah with his fellow Mini driver Peterhansel in third.
Sainz, a two-time former world rally champion, is in a strong position to add to his Dakar wins in 2010 and 2018.
With seven stages completed and five day's racing to go he enjoys a comfortable 10 minute cushion over last year's winner Al-Attiyah, with Peterhansel a further nine minutes adrift.
American Ricky Brabec retained his overall bike lead finishing fifth on the day behind Kevin Benavides.
Joan Barreda was initially marked down as the day's winner but Benavides was awarded back the time he had spent attending Goncalves.