The first four people who were arrested on suspicion of murder on Monday night (12 November) were subsequently released without charge. Those arrested on Monday were a 29 year-old woman, a 36 year-old man, a 48 year old woman and a 37 year old man all from Blackburn.
On the morning of Tuesday 13 November, a 30 year old woman, a 33 year old man and a 38 year old man were arrested on suspicion of murder and the police have reported that they are being interviewed. They are all again from Blackburn.
A post mortem has been carried out on the man who died in the fire but the cause of death is currently unascertained. While formal identification is yet to be carried out, at this time the person who died is understood to be Christopher Proctor, 88, who lived alone at the address. His family are aware.
An inquest has been opened and adjourned.
Detective Supt Paul Withers, who is leading the investigation, said: “I would appeal for anyone who has any information which may assist us in our inquiries to come forward and contact us.”