Two men have been arrested in connection with the "unexplained" death of a 17-year-old male in the Neath area.
Ashley Griffiths was found dead in the Melyn area of Neath after police were called on Monday.
A post mortem examination has been carried out but cause of death has yet to be determined.
The two men have been bailed pending further enquiries.
Detective Inspector Dave Hough, of Neath Port Talbot CID, said: "We are continuing to investigate the circumstances leading up to death of Ashley Griffiths and would appeal to anyone with information concerning his death to contact the police.
"We want to hear from anyone who may have seen him between 1pm and 5.30pm on Monday 8 November."
He added: "A number of people have already provided details to the police but we still want to hear from anyone else who may have information to help us piece together his movements prior to his death."
Anyone with information should contact police on 101 or the independent charity Crimestoppers anonymously on 0800 555 111.