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.”
The government is warning people not to travel to Israel under any circumstances, as the country’s missile exchange with Iran shows no sign of abating.
On Friday, the Foreign Office warned against “all but essential travel” to most of Israel.
The areas around Gaza, the West Bank and the Golan Heights were already classed as red zones, with warnings to avoid travel to these areas.
But the government has now updated the warning for the remainder of the country to red.
This puts Israel on the same level as Iran, and the change of advice is also likely to impact travel insurance.
However, with Israel’s airspace closed, it is unlikely many people will be attempting the journey, and Israel’s national airline El Al has announced it is cancelling flights to and from many European cities, as well as Tokyo and Moscow, until 23 June.
The change in travel advice comes after a second night of ballistic missile barrages from Iran following Israel’s attack in the early hours of Friday morning.
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An eight-storey residential building in Tel Aviv was hit by a missile last night.
On Sunday morning, Israel’s health ministry said 12 people had been killed over the past day, taking the total since Friday to 15. It also said 385 people had arrived at hospital with injuries overnight.
Iran has not provided a total number of deaths or overall casualties, but has claimed dozens have been killed.
Iran’s health minister has said most of those injured and killed in Israeli strikes were civilians. According to comments carried by news agency IRNA, he said the majority were women and children.
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The chancellor said UK forces could “potentially” be used to help defend Israel.
The UK government is sending military assets, including fighter jets, to the Middle East.
While the prime minister would not confirm to reporters that UK forces could be used to defend Israel from future Iranian attacks, the chancellor told Sky News earlier that the government is “not ruling anything out”.
Speaking to Sky’s Sunday Morning With Trevor Phillips, Rachel Reeves said sending military assets to the Middle East “does not mean that we are at war”, and emphasised that “we have not been involved in these strikes or this conflict”.
“But we do have important assets in the region,” she continued. “And it is right that we send jets to protect them. And that’s what we’ve done. It’s a precautionary move, and at the same time, we are urging de-escalation.”
Pushed on the question of what the UK would do if Israel asked for support with its operations, the chancellor replied: “I’m not going to rule anything out at this stage. It’s a fast-moving situation, a very volatile situation. But we don’t want to see escalation.”
A helicopter carrying Hindu pilgrims has crashed in India, killing seven people on board.
The accident happened within minutes of the helicopter taking off, officials said, on what should have been a 10-minute flight.
The helicopter was flying to Guptkashi, a prominent Hindu pilgrimage site in the Himalayas, from Kedarnath temple town in the northern Indian state of Uttarakhand.
It comes three days after an Air India flight crashed less than a minute after taking off from Ahmedabad airport in northwestern India, killing at least 270 people.
The helicopter, which was operated by private helicopter service Aryan Aviation, went down in a forested area several miles from the Kedarnath pilgrimage route at around 5.30am local time.
Officials said the crash was believed to have been caused by poor weather conditions.
Authorities say they have launched a search and rescue operation and are expected to review operational protocols for flights in the region.
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The dead include the pilot and pilgrims from the neighbouring state of Uttar Pradesh and western states of Maharashtra and Gujarat, according to officials. The bodies were badly burned in a fire that followed the crash, they said.
Image: Smoke and debris at the site. Pic: Reuters
Tens of thousands of pilgrims visit Kedarnath, which is home to one of the four most sacred Hindu temple shrines, each summer. Many use helicopter services due to the difficult mountainous terrain.
Helicopter mishaps are not uncommon in the region, where sudden weather changes and high-altitude flying conditions can pose risks.
Earlier this month, a helicopter operating in the Kedarnath Valley made an emergency landing shortly after taking off on a highway due to a technical fault. The pilot was injured but all five passengers on board were unharmed.
In May, a helicopter crashed in Uttarkashi district, killing six people, including the pilot. One person survived.
An Irish politician who was detained in Egypt trying to cross into Gaza says the police were violent towards the group after seizing his phone.
People Before Profit-Solidarity TD (MP) Paul Murphy was part of a large demonstration attempting to march to the Rafah crossing in a bid to get aid into the region.
The opposition politician said his phone and passport were confiscated on Friday before he was put on a bus to Cairo airport for deportation.
Footage of the seconds before his phone was seized shows authorities forcibly dragging protesters away from the sit-down demonstration.
Ireland’s deputy premier said several Irish citizens who were detained have now been released. Mr Murphy confirmed he was among the released protesters, posting a photo on his Facebook page saying he was back in Cairo and “meeting shortly to decide next steps”.
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In a message from Mr Murphy after he was detained, posted online by his social media team, he said: “I’m ok, but they still have my phone.
“Egyptian police say we’re going to airport but this isn’t the road we came on because there are 1000s of marchers on the streets. They’re taking us south past a lake, then west towards Cairo.
“Violence got worse after they seized my phone.
“One American woman in my group was badly kicked & beaten, and had her hijab torn off.”
Sky News has contacted Egypt’s police regarding Mr Murphy’s claims of violence towards the group.
Mr Murphy previously said other Irish citizen were among those who had been stopped from entering Gaza.
“The world has watched a horrific genocide for the past 20 months. Since March, a total attempt of starvation,” he added.
“And that this is a peaceful march to demand that it be ended and demand that western governments stop their complicity.”
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Mr Murphy’s partner, Councillor Jess Spear, had previously appealed to Ireland’s Foreign Affairs Minister and deputy premier Simon Harris to make a public statement on Mr Murphy’s detention.
She expressed “relief” that the group had been released from detention.
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3:59
The deadly road to Gaza aid point
She said: “However, they still want to reach Rafah to try and get humanitarian aid into Gaza. That has been the sole purpose of being in Egypt.
“Paul has appealed to Tanaiste Simon Harris to put pressure on the Egyptian authorities to let the marchers reach Rafah. The situation of the people of Gaza worsens by the day as they suffer starvation imposed by Israel.”