A 15 year-old boy questioned following the death of a teenager at Barry Island Pleasure Park has been released on bail.
16 year-old Taha Soomro from Grangetown, Cardiff, died following a medical epsiode at the amusement park late on Friday afternoon.
Detectives have again urged the public to avoid speculation on social media while an investigation continues to establish the exact circumstances surrounding Taha's death.
A 15 year-old boy from Grangetown arrested on suspicion of assault has since been released on bail pending further inquiries.
Barry Island Pleasure Park reopened to the public on Saturday morning after it closed following the incident.
In a statement, a spokesperson said its staff "did their best to assist the emergency services, but unfortunately, the boy suffered a medical emergency and could not be saved. Our thoughts and prayers are with the family at this very sad time."
A South Wales Police spokesperson said Taha's family are being updated by officers and detectives are particularly keen to receive any mobile phone footage.
Anyone with footage or information surrounding the incident can do so by visiting a special portal on the South Wales Police website or by calling 101, quoting reference no. 2500163611.
Alternatively, contact Crimestoppers anonymously on 0800 555 111.

Swapping date night for drysuits at Barry Dock RNLI
13,900 French Rugby Fans fly into Cardiff Airport ahead of Six Nations Fixture
Vale Councillor blasts school funding in the county
Bear Field Skate Park set for major upgrade as part of new Placemaking Plans
New apprenticeship courses in construction to be introduced in Wales
Former Penarth Bank could become a cafe
New poll shows majority of Welsh voters lack voting confidence ahead of Senedd Election
Construction hub secured for rail upgrades
Prolific thief banned from Holton Road
Cowbridge: plans for more holiday lodges
Man dies suddenly in Romilly Park
Cash boost for Sully Primary School
Speed limits reduced despite objections
Concern over imported chicken in school meals
A48 closed after three-vehicle collision
Rhys unveils red bench 'in living memory'
Barry: plans lodged for 70-home development