The teenager, from Resolven, was last seen on 22 March 2002 after leaving his home to attend a house party in Aberdulais.
Police have made regular appeals for more information to uncover what happened to Robert, including a Crimewatch Live appeal in 2021. The most recent appeal was made just two weeks ago.
Following the two arrests on Tuesday (26 September), a spokesperson for South Wales Police said: “A 59-year-old woman and a 35-year-old man were arrested early this morning and have since been bailed for further inquiries.”
Detective Inspector David Butt from South Wales Police, added: “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.”
(Lead image: South Wales Police / Family Photo)
