Police have arrested a teenage boy on suspicion of supplying class A drugs after a 13-year-old boy died after he was found unconscious in a park last week.
Carson Price was found on Friday evening in a park in Ystrad Mynach, near Caerphilly, South Wales, around a mile from his home in Hengoed.
Police believe "illegal substances" contributed to his death.
A 14-year-old boy was arrested on Thursday morning when officers raided an address in Pontllanfraith, Blackwood, Gwent Police said.
Detective Chief Inspector Alun Davies, the senior investigating officer, said: "A 14-year-old boy from the area has now been arrested on suspicion of supplying class A controlled drugs.
"He currently remains in police custody at Newport Central Police Station and will be interviewed with an appropriate adult as part of our investigation.
"I would encourage anyone with any further information that may assist with our inquiries to make contact with Gwent Police."
Superintendent Nick McLain said: "I'd like to thank all members of the community for their continued support during this tragic time.
"The information received from the public has been a vital part of the investigation. I would like to emphasise no one has been charged with any offences and the investigation is still continuing."
Carson's family have described him as "kind and loving" and "a cheeky little boy".
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Lewis School, where the teenager attended in nearby Pengam, said pupils and staff were "devastated".
The school wrote on Facebook: "At such an awful time I'm sure that everyone in our community will join with us in passing on our deepest condolences and sympathy to everyone touched by this tragic event.
"Support will be made available to any pupils or staff in the weeks ahead but in the meantime our thoughts are with the family, we literally have no words..."