- By Alex Pope, Mariam Issimdar & Sam Read
- BBC News, Norfolk
Norfolk Police contacted the independent watchdog, saying they did not respond to a 999 call from a house where a family were later found dead.
An emergency call was made from a man in a house in Costessey, near Norwich, at 06:00 GMT on Friday. Police resources were not deployed.
Police then entered the property at 07:15 and found the bodies of a man, a woman and two young girls.
The force has referred itself to the Independent Office for Police Conduct.
This is the second referral Norfolk Police has made to the IOPC following the deaths.
They confirmed their officers were also called to that house on December 14 as part of the missing persons investigation and said that particular investigation would now be reviewed.
On Friday, police said they were forced to enter the house in Allan Bedford Crescent following a call from a member of the public.
All four people who died were found with multiple injuries and autopsies will be conducted to determine their cause of death.
The man found dead in the house has since been identified by locals as Bartlomiej Kuczynski.
The road where the house is located, on the Queen’s Hills estate, remains closed while police investigate.
Inspector Chris Burgess said: “The man and two children lived at this address, but the woman involved was visiting and did not live at the property. Their next of kin have been informed and we are providing support.” help them.”
On Saturday, he added: “Today, the focus of our investigation remains on the address and we are checking local CCTV.
“While we are still investigating what happened, at this stage we are satisfied that this is an isolated incident.”
Police are appealing for anyone who may have been in the area on Friday morning, and who may have seen or heard anything, to contact them.
Vincent Burch, who lives on Allan Bedford Crescent, said one of the children who died attended the same primary school as his son.
He said he was “completely disappointed” by the incident.
On Friday night, the school sent parents an email notifying them of the death of a student.
“I think it’s better to tell my seven-year-old boy about what happened,” he said.
“I was a bit surprised by his reaction. He was a bit shocked but what could I do? I didn’t want him to find out from his friends or school on Monday.”
Justin Sandifer lives opposite the house where the family died and said the situation was “truly tragic”.
“It was a real shock what happened, it was completely unexpected. This doesn’t happen around here.
“Where I used to live in London you used to see police on guard but yesterday waking up to loads of police and ambulances arriving first thing in the morning – it was a really strange time.”
The Diocese of Norwich said its “thoughts and prayers” were with those affected by the tragic news, adding that churches in Old Costessey and Easton would be open.
The vicar of St Edmunds Church in Old Costessey, the Reverend James Pinto, said: “The overwhelming feeling is one of shock and sadness.
“People find it hard to believe that this could happen in our community.”
The church is open on Saturday afternoons for locals to come pray or light candles.