Police investigations were continuing today after a teenage boy was stabbed to death and two other family members were injured.
The 17-year-old was killed at a house in Ninian Road, Cardiff, at around 1.40pm yesterday afternoon, South Wales Police said.
The force is trying to trace two men seen leaving the area shortly after the incident and heading towards Shirley Road, Cardiff.
One of the men is described as being of Asian appearance, in his late 20s, of average height and stocky build, with dark hair and wearing dark clothing.
The second man is described as being of Asian appearance, in his early 20s, about 5ft 11in and slim. He was wearing a white jacket with a grey stripe down the sleeves.
A major incident room has been set up at Cardiff Central police station and yesterday uniformed police taped off Ninian Road and squad cars were parked at the end.
White plastic sealed the gate leading to the large end-terrace house and the pavements of adjoining Shirley Road were also closed.
One neighbour said: "I went out shopping and when I came back there were police and cars everywhere and the roads were shut but they let me in to park my car.
"I've never noticed any crime around here so I'm quite surprised this has happened but it is a busy road. I suppose it is one of those things, it hasn't made me frightened."
Chief Superintendent Bob Tooby, divisional commander of Cardiff Police, said last night: "This is a very serious incident and I wish to reassure the local community that a full investigation is under way in order to trace and arrest those responsible.
"Our thoughts are with the family of the victim, who will be supported by a trained family liaison officer at this most difficult time.
"I would urge anyone with information about this incident to come forward and speak to the police immediately."
Witnesses or anyone with information have been asked to contact the incident room at Cardiff Central police station on 02920 571530 or Crimestoppers, anonymously, on 0800 555 111.Reuse content