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The hunt for two masked men who murdered a teenager when he answered his front door is focusing on a shop in a nearby suburb.Aamir Siddiqi, 17, was stabbed to death by two masked men in front of his parents in the Roath Park area of Cardiff on Sunday.
On Tuesday evening, officers cordoned off a shop in the nearby Cathays area.
Neither the shop nor its occupants were "in any way" directly involved in the teenager's death, said police.
But South Wales Police said it was one of many positive lines of inquiry.
One theory police are investigating is that the murder was a case of mistaken identity.
Aamir's parents were also stabbed as they tried to protect him.
Officers are hunting two Asian men in their 20s.
Police and relatives have appealed to the city's Asian community for help in finding the killers.
In a statement, officers thanked "the community of Roath and Cathays for their on-going support and co-operation during this murder investigation".
The investigation at the shop was "one of many positive lines of inquiry being followed-up as a result of an excellent response from the public to our appeal for information".
The A-level student has been 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.
She said the family were "devastated by the departure of our beloved Aamir".
She added: "He was a dearly loved and loving brother, son and friend to many. Even within our own family Aamir was a friend, something precious that we will miss."
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 at around 1340 BST on Sunday.
Det Chief Supt Stuart McKenzie, who is leading the investigation, said: "It is clearly a hypothesis of ours that Aamir was mistakenly targeted.
"But that forms part of a number of hypotheses we have got. We have got to keep an open mind in this investigation."
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.
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.
On Tuesday evening, officers cordoned off a shop in the nearby Cathays area.
Neither the shop nor its occupants were "in any way" directly involved in the teenager's death, said police.
But South Wales Police said it was one of many positive lines of inquiry.
One theory police are investigating is that the murder was a case of mistaken identity.
Aamir's parents were also stabbed as they tried to protect him.
Officers are hunting two Asian men in their 20s.
Police and relatives have appealed to the city's Asian community for help in finding the killers. In a statement, officers thanked "the community of Roath and Cathays for their on-going support and co-operation during this murder investigation".
The investigation at the shop was "one of many positive lines of inquiry being followed-up as a result of an excellent response from the public to our appeal for information".
The A-level student has been 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.
She said the family were "devastated by the departure of our beloved Aamir".
She added: "He was a dearly loved and loving brother, son and friend to many. Even within our own family Aamir was a friend, something precious that we will miss."
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 at around 1340 BST on Sunday.
Det Chief Supt Stuart McKenzie, who is leading the investigation, said: "It is clearly a hypothesis of ours that Aamir was mistakenly targeted.
"But that forms part of a number of hypotheses we have got. We have got to keep an open mind in this investigation."
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.
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.