Police leading the search for missing British teenager Jay Slater in Tenerife have said their efforts are not being scaled back.
They said new resources had been brought in to help find the 19-year-old from Oswaldtwistle, who has been missing on the island for nine days.
Ground searches had concentrated on the area where his last mobile phone signal was traced.
The Guardia Civil has confirmed to the BBC that sniffer dogs which are specially trained to cover large areas are arriving from Madrid later.
The mayor of Santiago de Tiede, where Mr Slater’s father has been putting up posters appealing for information about his son’s disappearance, has expressed his sympathy for the family.
Emilio Navarro said: “As a father, I understand. All our resources and means are being used to find him.”
The apprentice bricklayer was staying at an apartment in the north of the Spanish island with friends he had met at the NRG festival he had attended, but after missing the bus the following morning, he called a friend to tell her he was going to make the 10-hour walk back.
Mr Slater also told her he had 1% battery on his phone, he had “no idea” where he was and needed water.
On Monday, police cars were seen parked at the entrance to a mountain track in the Rural de Teno National Park, close to the location where Mr Slater’s phone last pinged.
Mr Slater’s father has been appealing for help from the local community in Santiago del Teide, where the family went after an unconfirmed report of a possible local sighting.
Warren Slater said somebody “must know something”.
“I just want him to be found. End of,” he added.