As investigations continue into the deaths of four people at a home in Costessey, more has been revealed about the timeline of events surrounding the tragedy.

Police were called to Allan Bedford Crescent in Queen's Hills at around 7.15am on Friday after a dog walker raised concerns for the welfare of people inside.

Officers forced entry into the property and found the bodies of Bartlomiej Kuczynski, 45, his two daughters Jasmin, 12, Natasha, eight, and their maternal aunt Kanticha Sukpengpanao, 36.

Here is a timeline of events in the tragedy that has shaken a community.

December 14 - Missing persons enquiry

Norwich Evening News: Mr Kuczynski was reported missing in DecemberMr Kuczynski was reported missing in December (Image: Facebook)Officers were called to the address on December 14 in relation to a missing persons enquiry.

Neighbours said Mr Kuczynski had been reported missing and that police had used a drone to search the area with the father later found safe.

It is understood that officers took him to the Norfolk and Norwich University Hospital for assessment but that he left the Colney site unescorted before this could be carried out.

Neighbours said the 45-year-old had been struggling with mental ill health for several months, for which he had been asking for help.

January 19, 6am - First 999 call is made

It was revealed this weekend that police did not respond to a 999 call from the address an hour before the family were found dead.

It is understood that Mr Kuczynski made the call at 6am but police did not deploy resources to the address.

During the call he "expressed concerns for his own mental state saying he was confused".

January 19, 7am - Member of the public calls 999

A second 999 call was made at 7am after a dog walker became concerned for the welfare of the people inside. 

Police arrived on that scene at around 7.15am and forced entry to the address.

It has not been confirmed who the member of the public was.

January 20 - Second referral to IOPC

Norfolk Constabulary had referred itself to the Independent Office of Police Conduct (IOPC) in connection with the missing persons enquiry in December.

The force made a second referral on January 20 in connection with the 999 call made by Mr Kuczynski.

The IOPC said it would assess the circumstances of the call and determine the appropriate level of investigation required.

January 21 - Post-mortems carried out

Norwich Evening News: Kanticha Sukpengpanao was visiting Costessey from ThailandKanticha Sukpengpanao was visiting Costessey from Thailand (Image: Facebook)Post-mortem examinations were carried out on Mr Kuczynski and Ms Sukpengpanao on Sunday.

Mr Kuczynski died as a result of a single stab wound to the neck while Ms Sukpengpanao died from stab wounds to the neck. 

January 22 - Police chief calls for a review

Chief constable Paul Sanford said he had listened to the 999 call but could not comment on it as the IOPC is investigating all the circumstances around the handling of the tragedy.

But he has asked for a full independent review of the force's control room as a result of the call.

Mr Sanford revealed that he has asked His Majesty’s Inspectorate of Constabulary, which is due to carry out a routine inspection of the force next month, to extend the remit to carry out a "broader and deeper" investigation of the control room. 

He said it was very unusual to ask for a more robust inspection.

January 23, 2pm - 999 call details revealed

Norwich Evening News: Norfolk Constabulary is under investigationNorfolk Constabulary is under investigation (Image: Denise Bradley)The IOPC confirmed that it is investigating Norfolk Constabulary in relation to its contact with Mr Kuczynski.

The IOPC's regional director, Charmaine Arbouin, said: "During that call the man expressed concerns for his own mental state saying he was confused.

"He was advised to seek medical advice and police did not attend."

She added: "Following a mandatory referral from the force we have decided to investigate and will be examining if the force’s handling of the contact they had with the man was appropriate and in line with force policy, training and procedures."

January 23, 3pm - Family identified

Norwich Evening News: Jasmin and Natasha were found dead at their home in Costessey Jasmin and Natasha were found dead at their home in Costessey (Image: Facebook)Norfolk Constabulary has confirmed the names of the four people found dead at the home.

It identified the family as Bartlomiej Kuczynski, 45, Jasmin Kuczynska, 12, Natasha Kuczynska, eight, and Kanticha Sukpengpanao, 36.

Formal identification has not yet taken place.

January 24 - Post-mortems carried out 

Post-mortem examinations on Wednesday found the cause of death for both Jasmin and Natasha was knife wounds to the neck.

Detectives also confirmed that the deaths of the two girls and Ms Sukpengpanao are being treated as murder.

Detective Chief Inspector Chris Burgess, who is leading the investigation, said: "We understand how incredibly shocking this incident is for all involved and for the wider community and that this latest update adds to the sense of heartbreak.

"Our thoughts are with the family of those found at the property grieving such a traumatic loss.

"We would like to thank the community for their help and will continue to provide reassurance patrols in the area.

"A cordon will remain on at the address while we finalise our detailed examination of the scene."