A teenager has been questioned by detectives investigating a serious assault on a 15 year-old boy at Barry Island.
Police are still appealing for witnesses following the alleged group attack near Paget Road car park at around 7.30pm on Tuesday evening.
The victim needed hospital treatment after suffering minor injuries.
A 16 year-old boy from the Gwent area was arrested in connection with the assault and has since been released on bail.
South Wales Police said it was a "cowardly and vicious attack...which could have ended far worse".
Social media footage of the incident has also been examined as part of their investigation.
Detective Inspector Philip Marchant from Barry CID said: "I am sure the local community will be pleased to know that we have made an arrest. Our investigation into the incident is continuing and anyone who may be able to assist is urged to get in touch."
"Local officers are continuing to patrol the area during these busy Summer months to ensure the public are able to enjoy what the area has to offer feeling safe and reassured."
Anyone with information about the incident should contact Barry CID at South Wales Police on 101 or use the live web chat, quoting reference no. 2500258409.

Post Office Seeks New Operator in Dinas Powys as Village Faces Loss of Its Last Branch
Gardening team praised after helping police clear fallen tree near St Brides Major
Specsavers calls on children in Barry to design Wales Deaf Rugby World Cup shirts
Whitmore High Named One of UK’s Best Workplaces for Development
Steel Signing Marks Major Milestone in St Richard Gwyn School Redevelopment
Two Rescues in Record Heat as Volunteer Teams Respond to Afternoon Emergencies
Police find evidence of a large-scale cannabis cultivation at Riverside Place property fire
Network Rail confirm closure of Brookside level crossing in Dinas Powys
Police given powers to ask people to leave Comeston Lakes Country Park
Planned children’s role play centre could be given the go-ahead by Vale Council
Marie Curie Garden Fayre deemed huge success
Council seeks views on Future of Colcot Sports Centre and Buttrills Playing Fields
First Minister quizzed on further devolution, budget decisions, and misinformation in FMQs
Extreme heat leads to changes to services and closures
Severe Heat Warning Set to Disrupt Rail Travel Across South Wales This Week
Communities asked to support older people across Wales during severe heat warning
Caribbean Community Wales Brings Wales‑Wide Launch to Barry This Weekend
Community Award winner calls for sanitary bins in men’s toilets after living with prostate‑cancer‑related incontinence
Cardiff Airport Backs Holiday Safety Campaign Honouring Rhoose Teenager Tom Channon