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Police investigating the fatal stabbing of a teenager in front of his parents at their family home say one theory is that it was mistaken identity.Aamir Siddiqi, 17, was murdered by two masked men who broke in to the house in Roath, Cardiff, on Sunday afternoon.
His parents were also stabbed as they tried to protect him, police said.
Officers are hunting two Asian men in their 20s and the family home have appealed to the city's Asian community for help in finding the killers.
The A-level student was described as "a gentleman" and as "kind, sensitive and really funny" by his family.
His sister, Nishat Siddiqi, told a press conference on Tuesday that her brother was an upstanding young man, much loved by his family and friends.
Aamir's uncle, Dr Ahmed, spoke in Urdu to appeal to members of the Asian community for help.
A team of 60 officers are involved in the investigation and an incident room has been set up at Cardiff Central police station.
Officers said the Siddiqi family were "understandably going through an unbelievably traumatic time".
Police said two men armed with a "bladed weapon" forced their way into the end terrace house in Ninian Road in the city suburb of Roath at around 1340 BST on Sunday.
Det Chief Supt Stuart McKenzie, who is leading the investigation, said Aamir's parents, aged 55 and 68, suffered stab wounds as they tried to protect their son.
One suspect is described as being in his late 20s, of average height, with a stocky build. He had dark hair and was wearing dark clothing.
The other was in his early 20s, of slim build, and 5ft 11ins (1.8m) tall. He was wearing a white jacket with a grey stripe down the sleeves.
As they were leaving the area they were seen pulling black knitted balaclavas over their faces, said police.
Anyone with information is asked to contact the incident room at Cardiff Central Police Station on 02920 571530 or Crimestoppers anonymously on 0800 555 111.This article is from the BBC News website. ? British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.