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.

Vueling withdraws winter flights to Aicante this winter
Playground in Barry forced to close after fire damages equipment
Campaigners Take Fight for Fairer Pathways in Welsh Women’s Football to Parliament
Vale Councillor Gwyn John Launches His First Novel at Llantwit Major Book Signing
Pink poppy display commences with celebration of life
Former Barry office block converted into new homes for people at risk of homelessness
Welsh Government publishes independent report on Level 4 intervention at Cardiff and Vale UHB
Three CoastSnap stations set to be installed along the Glamorgan Heritage Coast
Daffodil Runner statue installed at Marie Curie Hospice in Penarth
Vale entrepreneur wins national Innovate UK award for sustainable construction technology
Cardiff Airport retains top accessibility rating as regulator reports record demand for assistance
Open Doors event to showcase hidden world of Glamorgan Archives
New details have emerged of a new tree-lined public square that will replace a traffic dominated junction
Dyffryn Gardens’ Edwardian rose garden blooms again after decade-long restoration
Barry’s Own Daniel White to Walk 190 Miles Back to Where His Round Table Story Began
1,300 people attend Flying Start Family Fun Day
Dispersal order put in place to tackle anti-social behaviour
Interim Chief Executive Appointed at Cardiff and Vale University Health Board
Cardiff Theatre Marks 50 Years of Service for Long‑Standing Staff Member