Father of missing Jay Slater says the investigation 'stinks' and asks why two men who drove him to a remote AirBnB were ruled out of any involvement

Missing Jay Slater's father has questioned why two men who drove his son to a remote Tenerife AirBnB have been ruled out of having any involvement with his disappearance almost three weeks ago.

Warren Slater, 58, spoke out after completing a gruelling eight-hour search in 25C heat under a blazing sun in a remote valley where Jay's phone last pinged on June 17.

Just hours earlier Jay, 19, had been driven to the mountain village of Masca by a convicted drug dealer named by MailOnline as Ayub Qassim, 31, and another man who has not been identified and despite being among the last who saw him both have been deemed 'irrelevant' by Spanish police.

'Everything stinks. It's just a riddle and I don't know the outcome,' Warren said.

Ayub Qassim previously said he had invited Jay back to his rented holiday cottage after a rave in in the hours before he vanished on June 17. He previously told MailOnline: 'He came to my Airbnb alive and he left my Airbnb alive.' 

Warren told MailOnline: 'We're going round and round in circles. The Spanish police, you can't go screaming and shouting at them because they don't do anything.

'If you start screaming and shouting they won't do anything even more. If they want to go and search a house, they have to go to court first.'

'You need Columbo,' he added. 'So when you get home, get me a Columbo.

Warren, who was joined in the search by his other son Zak, 24, is in Tenerife with Jay's mother Debbie Duncan, 55. 

All have vowed to remain there until the missing apprentice bricklayer from Oswaldtwistle, Lancashire, is found.

He said: 'It's the fourth time I've done this. It was hard, I nearly put my eye out. Tell me where I look, I can only go off the last sighting, the woman in that restaurant saw him going the wrong way.

'Which human being lets a young boy go the wrong way?'

Warren also hit out at the turn out for last Saturday's 'final push' when a call for volunteers from Spanish police to search the remote area of the Parque Rural de Teno was answered by just six people.

He said: 'I was quite disappointed last Saturday when they did the search, they said the whole island was going to turn out.

'Let all the big boys do it, the police told me the big, big search was Saturday. We got down in that valley at 2pm and there wasn't a soul.

'They might have been there I don't know, they might have been there before me. But I was quite disappointed because I expected every fire engine, ambulance, looky looky man and every prostitute to be looking for him.

'The way they made it out, when they said they were going to have the biggest ever search.'

Venting his frustration he said: 'You've walked from that BnB at 9am, you've walked all the way up here - he's a young fit lad - all the way.

'You're trying to tell me no car, no one's seen him at half past 10? Why would you go down there? You've got to end. Why go any further?

'Why would you leave this road? You haven't got a clue where you are. And no one else has seen him. One woman, he's knocked on her door, she said at 10 and he went the wrong way.

'This morning I've seen her, she didn't want to stop. It's somebody's son, you know if you're the last person to see someone's son, you try your damndest to help don't you? She must be a grandma.

'If your son was here what would you do? If he was at the top of that rock you'd climb it.'