The devastated relatives of two teenagers who died in an apparent suicide pact may never know what led to the tragedy, an inquest heard.

The Leeds inquest heard how 17-year-olds Graham Myers, of Westover Gardens, Pudsey, and Kevin Cleary, of Farfield Drive, Farsley, were found in a fume-filled Ford Orion in the Bankhouse Inn's car park in Bankhouse Lane, Pudsey, on December 10.

A length of hosepipe attached to the locked car's exhaust ran through a partially-opened window, the hearing was told.

Kevin, who worked as a warehouseman, and jobless Graham were found on the reclined front seats covered by a duvet with the engine still running.

The inquest heard the cause of death in both cases was carbon monoxide poisoning and tests showed no trace of alcohol or drugs in the teenagers' systems.

Tests also revealed no evidence of either being restrained or assaulted while it was thought an abrasion on Kevin's head had possibly been caused during his removal from the car, the inquest heard.

Detective Sergeant Geoffrey Fox, of Pudsey CID, said a letter from Graham to his mother and a poem had been found in the car although they "could not be described as suicide notes'' and no other letters explaining what had happened were ever found.

He said: "There's no evidence that anyone else was involved. There were no suspicious circumstances.''

The inquest heard how Graham's mother Belinda Myers saw the boys the previous evening when they borrowed the duvet and hosepipe, telling her they were giving it to a friend in exchange for letting them stay at his house although she thought they were going to use it to syphon petrol from another vehicle.

She had told police the pair had been to Blackpool and Dorset over the previous couple of weeks, visiting Graham's relatives and looking for work.

In a statement read to the hearing, she said her son and Kevin had appeared to be in good spirits and were talking about going to Scotland or abroad. There was no indication they were depressed.

West Yorkshire Coroner David Hinchliff recorded verdicts of suicide, but said: "The motivation for that I can never begin to estimate. There's no suggestion that one exerted force over the other.''

Following the hearing, Bradford-born Kevin's family claimed he had changed since starting to "hang around'' with Graham about two weeks earlier and may have been "influenced'' by him.

Kevin's mother Julie, 37, revealed how she, her husband Peter, 52, and their daughters Leeann, 21, and Samantha, 19, lit candles in his memory each evening, and added: "We're all devastated. It's something we're never going to get over.

"We've been told we'll probably never know why it happened, but there's just no way he would have taken his own life.

"We'll be seeking legal advice to see if we can pursue things further.''

Belinda Myers, 38, who has three daughters, said: "Kevin wasn't frightened of him to my knowledge - they seemed to get on really well. I haven't got a clue why they did it - they were full of beans the day before. I've resigned myself to the fact that we'll never know."