Police have been given an extra 24 hours to question a man arrested on suspicion of the murder of three generations of one family.
Kim Buckley, 46, daughter Kayleigh, 17, and six-month-old Kimberley all died in arson attack at their home yesterday.
The fierce blaze at 15 Tillsland, Coed Eva, Cwmbran, south Wales, ripped through the property in the early hours of the morning.
The teenaged mother had recently given birth to twin daughters and was still coming to terms with the tragedy of losing one shortly after birth.
Carl Mills, 27, the father of the twins, was named locally yesterday as the boyfriend arrested by police on suspicion of murder.
Gwent Police have now been granted extra time to question Mills, who is from the Manchester area.
"A 24-hour warrant of further detention was granted by Caerphilly Magistrates Court this afternoon," a police spokesman said.
"Officers are continuing to investigate the cause and the circumstances surrounding the fire."
The close knit community on the Cwmbran estate where the family lived is struggling to come to terms with the triple tragedy.
Grandmother Kim Buckley has been described as "a popular character" who was both liked and familiar to many in the area.
Friends have also spoken of the joy she felt at becoming a grandmother.
Others have spoken of the stormy relationship she had with her daughter's boyfriend who is said to have threatened to kill her.
Police officers remained at the scene of the tragedy today offering support and information to anyone with concerns.
Anyone who heard or saw anything suspicious leading up to the fire is urged to call 101 or Crimestoppers on 0800 555 111.