Detectives investigating the murder of a heavily pregnant teenager in Newport have released images of four people who may be able to help them.
The couple and two men were captured on CCTV in the early hours of Saturday morning in and around the Broadmead Park, Moorland Park and Pontfaen areas.
Nikitta Grender's body was found after a fire at her Broadmead Park flat.
Police have been given a further 12 hours to question a 26-year-old man about the 19-year-old's death.
Carl Whant of Newport was arrested on suspicion of murder on Wednesday.
Gwent Police said the four members of the public were captured on CCTV in the early hours of Saturday morning - the day Ms Grender's body was discovered.
Officers want them to contact the force as they may have seen something relevant to the investigation.
The first image was taken from the back of Moorland Park Community Centre and shows a couple walking toward the bridge between Moorland Park and Broadmead Park at 0341 GMT.
The second shows a male walking on Fosse Road, Pontfaen, at 0559 GMT.
The final image was also taken from the back of Moorland Park Community Centre and shows a male, possibly carrying a bag with a reflective strip on it, walking toward the new bridge at 0556 GMT.
Ms Grender's body was discovered with two stab wounds in the bedroom of her flat following a fire.
'Vital piece of information'
She was heavily pregnant at the time of her death.
Police are continuing to search for a weapon, believed to be a knife.
Searches are continuing in and around the estate and at two other premises in the city.
Det Supt Geoff Ronayne, who is leading the investigation, said: "CCTV is just one line of inquiry we are following.
"These people captured could have important information for us, [they] may have seen something that to them is irrelevant however it could be a vital piece of information we need.
"We are continuing with forensic analysis and house-to-house [enquiries].
"We are grateful for the help we are being given from the local community however we still need people who knew Nikitta, who have been to her flat and for people who have private CCTV in the area to get in touch."
Contact the major incident room on 01443 865562, alternatively call 01633 838111 or Crimestoppers on 0800 555111.