The heartbroken mum of a teenager who went missing more than 20 years ago remembers his final words like they were yesterday.

       Schoolboy Robert Williams, 15, left his home in Resolven, Neath, Wales, on March 22, 2002, to attend a house party in Tair Felin, Aberdulais, and never returned.

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       Missing Robert Williams, 15, of Resolven, near Neath, South Wales Credit: PA 3

       Robert's devastated mother Cheryl Davies appealed for information Credit: Wales Online / Media Wales

       Mum Cheryl Davies remembers the morning she last saw him, and the words he said to he before he vanished.

       She said: "The morning Robert went missing was just like any other morning.

       "He said: 'I am off out mam, see you later' and he looked so happy going around the corner."

       Now 21-years later, a 59-year-old woman and a 35-year-old man have been held by detectives investigating his disappearance.

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       South Wales Police said the woman and man were arrested on Tuesday and have since been bailed pending further inquiries.

       Earlier this month mum Cheryl, 52, had appealed for anyone with information about her son's disappearance to speak to police.

       "I know that Robert is never coming home. I just want his body back so I can bury him," she said.

       "He deserves that. I don't want him out there on his own and we need closure as a family."

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       Ms Davies added: "Someone out there knows what happened to him.

       "As a mother knowing my child is lying somewhere has destroyed me emotionally and physically. I need to know what happened to him."

       Two years ago Ms Davies shared a tribute to her son and recalled the last time she ever saw him.

       Speaking to BBC's Crimewatch Live she said: "He was a character – he always made you laugh. He loved his sport.

       "He was never without a ball, a rugby ball or a football, he just loved everything about it."

       She says her memory of him leaving the house still haunts her. She said: "Just every day I think about that because that is the last time I have ever seen him."

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       Police issued a picture of how Robert would look aged 23 in July 2020 Credit: Wales Online / Media Wales

       While police and local people conducted a frantic search of the Resolven area in the days following Robert's disappearance they've never been able to find him.

       "I never did see him. I never could find him. I still have to look out the window of my home – it is like a comfort for me," Ms Davies further told Crimewatch Live.

       "Every night I still look, every morning I look. It is just something I feel I have to do.

       "We know Robert is no longer here any more, and we accept that – we have no choice. There is not a day goes by when I do not think about him.

       "I know somebody out there knows something. Somebody was the last person to see my son alive.

       "It is all we want as a family is to fetch him home and lay my son to rest like any other parent would, where you have somewhere to go to grieve and you know where they are.

       "The slightest thing that you might think is not important might be really important to us. I would just ask them to come forward."

       Detectives believe the community in Aberdulais holds the key to what happened to Robert, who would have turned 37 on September 9.

       In 2011 a year-long case review concluded that the teenager is most likely dead, having found no evidence to show he is alive.

       Detective Inspector David Butt said: "Robert's mum Cheryl has been updated on these arrests and our thoughts are very much with Robert's family at this difficult time.

       "Our priority is supporting them whilst we work through this new line of inquiry in the investigation.

       "We ask that their privacy is respected as our investigation continues."

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       Anyone with information is asked to contact South Wales Police by emailing swp101@south-wales.police.uk, calling 101, or using the Live Chat service on the South Wales Police website here and quoting occurrence number 2300 2717 56.

       Alternatively you can give information anonymously by calling Crimestoppers on 0800 555 111.