His mother, a team of mountain rescuers, and the local civil guard are searching for him after he disappeared while holidaying with friends.
Ms Law said he rang her to say he “didn’t know where he was”, that he “needed a drink” and had “cut his leg on a cactus”.
Despite his mobile phone battery being down to 1% he managed to send her a photo of his location.
When she told him to return to where he had walked from, he said he did not know where that was, Ms Law said.
He was without food and water, she added, and had been in a T-shirt and shorts. “It’s very warm in the day and very cold at night,” she told the UK Tonight programme on Sky News.
“So in the day he’s going to be really warm without a drink, and then at night he’s going to be very cold without any suitable clothing.”
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Ms Law and others have printed off posters in both Spanish and English and have plastered them “everywhere”, she said.
Image: His phone’s last live location was Rural de Teno Park. The search has also focused on Los Cristianos
Soon after Mr Slater went missing, an American woman offered to drive Ms Law up into the mountains.
There was “literally no sign of him anywhere”, she said. “We drove around all day.”
Mr Slater had posted a picture online of some mountains next to a house he had been to.
Ms Law drove around looking for a lamp and some flowers seen in that picture.
“We managed to find the house,” she said. “I knocked on the door and there were two people there.”
They told Ms Law that Mr Slater had gone out for a cigarette before going back in and saying he wanted to go home.
Image: Masca, Rural de Teno Park, Tenerife. Pic: iStock
“They told me he’d spoken to the next door neighbours and they’d told him there was a bus every 10 minutes back down to Los Cristianos.
“The bus stop was right next to the house. So obviously if he’d gone to get the bus he wouldn’t have got lost because it [the stop] was visible from the front door.”
The trip back down from the mountains is an hour’s drive. “Everything looks the same – it’s just a road and hills,” Ms Law said.
“I can’t understand why he would come out of the house and then decide he was going to walk. I think he maybe set off walking with battery and had not realised how far the walk actually is.”
There are “so many questions that are unanswered”, Mr Slater’s friend said.
Image: Jay Slater. Pic: Lucy Law
‘He’s not a stupid boy’
“The thing I find the most weird about this is the fact that there’s nobody that’s seen him.
“And he’s not a stupid boy – he’s got some nous about him.
“I’ve seen so many people up here and I’ve asked every single one if they’ve seen him – this is what I find weird.
“If he’d seen somebody, or a car, he would have flagged down the car – he would have said he needed a phone to contact someone.”
She added: “He would never have his family worrying like this – he would never have us worrying like this.
“If he saw someone, the first thing he would do is say ‘I need to ring my mum’ – I know that for a fact. He would never ever have his mum worrying like this.
“It’s just awful – I’ve never in my life been so worried.
“I’ve literally not slept at all since.”
The Spanish Civil Guard told UK media they are “doing everything possible” to find Mr Slater.
“A specialist mountain rescue and intervention group called the Greim have been mobilised.
“A police helicopter is also out and focusing on the area around the village of Masca.
“Other emergency services including firefighters have also been mobilised.”
A large-scale Russian attack through the night into Sunday injured at least 11 in Kyiv and killed three people in towns surrounding the capital.
There were attacks elsewhere as well, including drone strikes in Mykolaiv, where a residential building was hit.
Image: An apartment building destroyed after a Russian attack in Mykolaiv. Pic: State Emergency Service of Ukraine
‘Massive’ attack
In Kyiv, the city’s administration warned “the night will be difficult”, as people were urged to remain in shelters.
The city’s mayor Vitaliy Klitschko described it as a “massive” attack.
He said: “Explosions in the city. Air defence forces are working. The capital is under attack by enemy UAVs. Do not neglect your safety! Stay in shelters!”
It came after at least 15 people were injured in attacks the night prior.
Russia claimed it also faced a Ukrainian drone attack on Sunday, and that it intercepted and destroyed around 100 of them near Moscow and across Russia’s central and southern regions.
Image: A municipality worker cleans up after a Russian drone strike on Kyiv. Pic: Reuters
Russia ‘dragging out the war’
Meanwhile, Russia and Ukraine continued a prisoner exchange, marking a rare moment of cooperation in the war.
Amid the most recent attacks, Ukrainian President Volodymyr Zelenskyy repeated his calls for sanctions on Russia.
Russia “fills each day with horror and murder” and is “simply dragging out the war”, he said.
Image: A resident looks at an apartment building that was damaged in a Russian drone strike. Pic: Reuters
“All of this demands a response – a strong response from the United States, from Europe, and from everyone in the world who wants this war to end,” Mr Zelenskyy added.
Every day “gives new grounds for sanctions against Russia”, he said, and each day without pressure proves the “war will continue”.
Ukraine, meanwhile, is ready for “any form of diplomacy that delivers real results”.
Nine of a doctor’s 10 children have been killed in an Israeli missile strike on their home in Gaza, which also left her surviving son badly injured and her husband in a critical condition.
Warning: This article contains details of child deaths
Alaa Al Najjar, a paediatrician at Al Tahrir Clinic in the Nasser Medical Complex, was at work during the attack on her home, south of the city of Khan Younis in southern Gaza, on Friday.
Graphic footage shared by the Hamas-run Palestinian Civil Defence shows the bodies of at least seven small children being pulled from the rubble.
Rescuers can be seen battling fires and searching through a collapsed building, shouting out when they locate a body, before bringing the children out one by one and wrapping their remains in body bags.
In the footage, Dr Al Najjar’s husband, Hamdi Al Najjar, who is also a doctor, is put on to a stretcher and then carried to an ambulance.
The oldest of their children was only 12 years old, according to Dr Muneer Alboursh, the director general of Gaza’s health ministry, which is run by Hamas.
Image: Nine children were killed in the strike. Pic: Palestinian Civil Defence
“This is the reality our medical staff in Gaza endure. Words fall short in describing the pain,” he wrote in a social media post.
“In Gaza, it is not only healthcare workers who are targeted – Israel’s aggression goes further, wiping out entire families.”
Image: Pic: Palestinian Civil Defence
British doctors describe ‘horrific’ and ‘unimaginable’ attack
Two British doctors working at Nasser Hospital described the attack as “horrific” and “unimaginable” for Dr Al Najjar.
Speaking in a video diary on Friday night, Dr Graeme Groom said his last patient of the day was Dr Al Najjar’s 11-year-old son, who was badly injured and “seemed much younger as we lifted him on to the operating table”.
Image: Hamdi Al Najjar, Dr Al Najjar’s husband who is also a doctor, was taken to hospital. Pic: Palestinian Civil Defence
The strike “may or may not have been aimed at his father”, Dr Groom said, adding that the man had been left “very badly injured”.
Dr Victoria Rose said the family “lived opposite a petrol station, so I don’t know whether the bomb set off some massive fire”.
Image: Pic: Palestinian Civil Defence
‘No political or military connections’
Dr Groom added: “It is unimaginable for that poor woman, both of them are doctors here.
“The father was a physician at Nasser Hospital. He had no political and no military connections. He doesn’t seem to be prominent on social media, and yet his poor wife is the only uninjured one, who has the prospect of losing her husband.”
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2:21
Nineteen of Gaza’s hospitals remain operational, all of them are overwhelmed with the number of patients and a lack of supplies
He said it was “a particularly sad day”, while Dr Rose added: “That is life in Gaza. That is the way it goes in Gaza.”
Sky News has approached the Israeli Defence Forces for comment.
Israel’s war against Hamas in Gaza began when the militant group stormed across the border into Israel on 7 October 2023, killing some 1,200 people, most of them civilians, and abducting 251 others.
Israel’s military response has flattened large areas of Gaza and killed more than 53,000 Palestinians, mostly women and children, according to Gaza’s Hamas-run health ministry, which does not differentiate between civilians and combatants in its count.
The head of the UN has said Israel has only authorised for Gaza what amounts to a “teaspoon” of aid after at least 60 people died in overnight airstrikes.
UN secretary general Antonio Guterres said on Friday the supplies approved so far “amounts to a teaspoon of aid when a flood of assistance is required,” adding “the needs are massive and the obstacles are staggering”.
He warned that more people will die unless there is “rapid, reliable, safe and sustained aid access”.
Image: A woman at the site of an Israeli strike in Jabalia, northern Gaza. Pic: Reuters
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1:44
Gaza: ‘Loads of children with huge burns’
Israel says around 300 aid trucks have been allowed through since it lifted an 11-week blockade on Monday, but according to Mr Guterres, only about a third have been transported to warehouses within Gaza due to insecurity.
The IDF said 107 vehicles carrying flour, food, medical equipment and drugs were allowed through on Thursday.
Many of Gaza’s two million residents are at high risk of famine, experts have warned.
Meanwhile, at least 60 people have been killed by Israeli airstrikes across Gaza overnight.
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Ten people died in the southern city of Khan Younis, and deaths were also reported in the central town of Deir al-Balah and the Jabaliya refugee camp in the north, according to the Nasser, Al-Aqsa and Al-Ahli hospitals where the bodies were brought.
Image: A body is carried out of rubble after an Israeli strike in Jabalia, northern Gaza. Pic: Reuters
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3:08
‘Almost everyone depends on aid’ in Gaza
The latest strikes came a day after two Israeli embassy workers were killed in Washington.
The suspect, named as 31-year-old Elias Rodriguez from Chicago, Illinois, told police he “did it for Gaza”.
Israeli Prime Minister Benjamin Netanyahu accused Sir Keir Starmer, Emmanuel Macron and Mark Carney of fuelling antisemitism following the shootings.
Mr Netanyahu also accused Sir Keir, Mr Macron and Mr Carney of siding with “mass murderers, rapists, baby killers and kidnappers”.
Image: Palestinians search for casualties in Jabalia, northern Gaza. Pic: Reuters
But UK government minister Luke Pollard told Sky News on Friday morning he “doesn’t recognise” Mr Netanyahu’s accusation.
Earlier this week, Mr Netanyahu said he was recalling negotiators from the Qatari capital, Doha, after a week of ceasefire talks failed to bring results. A working team will remain.
The war in Gaza began when Hamas-led militants attacked southern Israel on 7 October 2023, killing some 1,200 people, mostly civilians, and kidnapping 251 others.
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The militants are still holding 58 captives, around a third of whom are believed to be alive, after most of the rest were returned in ceasefire agreements or other deals.
Israel’s offensive, which has destroyed large swaths of Gaza, has killed more than 53,000 Palestinians, mostly women and children, according to Gaza’s Hamas-run health ministry.