Canary Islands regional president Fernando Clavijo said police suspected arson and had opened three lines of investigation, but did not reveal whether there had been any arrests.
Tourists on the Spanish island are among those who have been affected by the impact of the fire.
‘Very difficult night’
Hundreds of soldiers and firefighters have been deployed to get the flames under control, and improved weather conditions helped them make more progress on Sunday.
Governor Rosa Davila said after a “very difficult night”, emergency services had enjoyed some “positive results”.
Many locals are sheltering in sports halls, clubs, and pavilions and no injuries have been reported.
People are being urged to stay inside due to the poor air quality, and to wear masks if they must venture outdoors.
Despite the apocalyptic scenes, Ms Davila said no homes had been lost yet, but 29,000 acres of pine forest and scrubland have been burned, and mountainous terrain around some towns is proving challenging for firefighters.
Water-carrying helicopters and planes are assisting with the response, which has not been helped by the fact the Canary Islands have been in drought for much of the past few years.
There has been below-average rainfall because of changing weather patterns caused by climate change.
Meanwhile, Spain‘s mainland is expected to endure heatwave temperatures for the next several days, with temperatures topping 40C (104F) on Wednesday and Thursday.
More than a dozen people are missing after a tourist boat sank in the Red Sea off the coast of Egypt, officials have said.
The boat, Sea Story, was carrying 45 people, including 31 tourists of varying nationalities and 14 crew.
Authorities are searching for 17 people who are still missing, the governor of the Red Sea region said on Monday, adding that 28 people had been rescued.
The vessel was part of a diving trip when it went down near the coastal town of Marsa Alam.
Officials said a distress call was received at 5.30am local time on Monday.
The boat had departed from Port Ghalib in Marsa Alam on Sunday and was scheduled to reach its destination of Hurghada Marina on 29 November.
Some survivors had been airlifted to safety on a helicopter, officials said.
It was not immediately clear what caused the four-deck, wooden-hulled motor yacht to sink.
The firm that operates the yacht, Dive Pro Liveaboard in Hurghada, said it has no information on the matter.
According to its maker’s website, the Sea Story was built in 2022.
Russia launched a large drone attack on Kyiv overnight, with Volodymyr Zelenskyy warning the attack shows his capital needs better air defences.
Ukraine’s air defence units shot down 50 of 73 Russian drones launched, with no immediate reports of damage or injuries as a result of the attacks.
Russia has used more than 800 guided aerial bombs and around 460 attack drones in the past week.
Warning that Ukraine needs to improve its air defences, Ukrainian President Volodymyr Zelenskyy said: “An air alert has been sounded almost daily across Ukraine this week”.
“Ukraine is not a testing ground for weapons. Ukraine is a sovereign and independent state.
“But Russia still continues its efforts to kill our people, spread fear and panic, and weaken us.”
Russia did not comment on the attack.
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It comes as Russian media reported that Colonel General Gennady Anashkin, the commander of the country’s southern military district, had been removed from his role over allegedly providing misleading reports about his troops’ progress.
While Russian forces have advanced at the fastest rate in Ukraine since the start of the invasion, forces have been much slower around Siversk and the eastern region of Donetsk.
Russian forces have reportedly captured a British man while he was fighting for Ukraine.
In a widely circulated video posted on Sunday, the man says his name is James Scott Rhys Anderson, aged 22.
He says he is a former British Army soldier who signed up to fight for Ukraine’s International Legion after his job.
He is dressed in army fatigues and speaks with an English accent as he says to camera: “I was in the British Army before, from 2019 to 2023, 22 Signal Regiment.”
He tells the camera he was “just a private”, “a signalman” in “One Signal Brigade, 22 Signal Regiment, 252 Squadron”.
“When I left… got fired from my job, I applied on the International Legion webpage. I had just lost everything. I just lost my job,” he said.
“My dad was away in prison, I see it on the TV,” he added, shaking his head. “It was a stupid idea.”
In a second video, he is shown with his hands tied and at one point, with tape over his eyes.
He describes how he had travelled to Ukraine from Britain, saying: “I flew to Krakow, Poland, from London Luton. Bus from there to Medyka in Poland, on the Ukraine border.”
Russian state news agency Tass reported that a military source said a “UK mercenary” had been “taken prisoner in the Kursk area” of Russia.
The UK Foreign Office said it was “supporting the family of a British man following reports of his detention”.
The Ministry of Defence has declined to comment at this stage.