Detectives want to speak to these three men captured on CCTV footage near the time of the Norton blaze.
Jamie, 18, and 19-year-old Jan died in the into the suspected arson attack in the early hours of September 5 at Buckrose Court.
These men were seen walking together along Church Street past the Derwent Arms at around 1:46 on the morning of the fire.
Investigating officers have now released these CCTV images of people they would like to speak to so they can be eliminated from their inquiries Police say a further three people, shown in a previous CCTV appeal, have also yet to come forward.
One picture shows a man dressed in dark clothing walking past the Derwent Arms at 1:50am on 5 September.
A second image is of two men, one dressed in dark trousers and jacket with a lighter coloured top underneath, the other wearing light-coloured short-sleeved t-shirt and dark jeans, walking past the swimming pool in Church Street at a 1:48am.
The men are then seen in a separate picture, talking together near the junction with Scarborough Road until about 2:10am.
Police are treating the fire as suspicious and said several people have come forward who were in the area at the time but there are still people they would like to speak to.
Superintendent Alan Carey who is heading the investigation, said: "It could be that the potential witnesses believe they don't have any significant information, but we still need them to come forward as they could help us piece together the full picture of the tragic events that morning"
A local man who was arrested in connection with the incident remains on police bail.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules hereComments are closed on this article