A workforce of 20 detectives are investigating a “large disturbance” that passed off in Queen Street at about 9.50pm on Saturday.
Three people had been rushed to hospital after allegedly being stabbed, one of many wounded suffered head accidents.
Police mentioned three people remained at Cardiff’s University Hospital of Wales on Sunday and one other person is being handled at Llandough Hospital in Penarth. None of the accidents are believed to be life-threatening.
South Wales Police mentioned it was an “isolated incident involving local youths” and urged dad and mom who suspect their little one was concerned to return ahead.
Four people had been arrested on suspicion of violent dysfunction on Sunday.
Detective Superintendent Esyr Jones mentioned: “This was a violent and utterly unacceptable incident, which has understandably brought on alarm inside the local people.
“A workforce of 20 detectives are at present investigating the incident, trawling via huge quantities of CCTV and talking to a variety of witnesses, and I need to reassure the general public that we’ll be relentless in figuring out and arresting all these concerned.
“This seems to have been an remoted incident involving native youths, all of whom can look forward to finding officers knocking at their doorways as inquiries progress.
“We work closely with a wide range of partners to ensure that incidents of this nature are rare and the public should be assured that Cardiff remains a safe place in which to live, work and visit.”
He added: “We are persevering with to attraction to anybody who witnessed the incident or who has data which may help the investigation to return ahead.
“In explicit, I’d urge any guardian who suspects their little one was concerned in any strategy to come ahead.
“Tackling knife crime is the responsibility of us all and any parents who have suspicions about their children being involved are not protecting them by remaining quiet.”
A Taser was additionally used to detain one man who police mentioned had obstructed officers responding to the incident.
He just isn’t believed to have been concerned in the dysfunction.