A mother suffered life-changing injuries as she leapt from a second-floor window to escape a house fire that claimed the lives of her two young children.
Police and fire service personnel are continuing to investigate the cause of the blaze at the three-storey house in Buttercup Avenue in Eynesbury, Cambridgeshire.
Cambridgeshire Police said it is believed the fire broke out at around 7am on Thursday.
The force said that a three-year-old boy and a seven-year-old girl were pronounced dead at the scene.
Their 35-year-old mother was taken to hospital with life-changing injuries and her partner, a 46-year-old man, suffered minor injuries.
Police said that the mother’s injuries were caused by jumping from a second-floor window.
Police said in a statement: “The cause of the fire is yet to be established, however police are working with fire investigators to get to the route of the blaze.”
A white forensic tent was put up in front of the property on Friday, with a police scientific support unit and Hertfordshire Fire and Rescue Service’s fire investigation dog team on scene.
Soft toys and floral tributes were left on a verge near the house.
A message left on one teddy bear said: “We have no words. So heartbroken. Hope you are all in a better place. XXX.”
Windows on the terraced home’s second and third floors are completely burnt-out with the rooms inside blackened and guttering melted away.
The house is on a modern estate near St Neots, with many homes decorated for Christmas – including a festive wreath on one immediate neighbour’s door.
Neighbour Charles Cooper, 30, said: “The flames went up fairly swiftly.
“By the time my wife and I woke up the firefighters had already arrived.
“It took a good three or four hours before the smoke abated.
“The flames were coming out of the top window.”
He said he did not know the family to speak to but said “we would give them a wave”.
He added: “I’ve seen the children playing in the garden.
“Everyone’s perfectly polite and pleasant but it’s not the sort of place we all get together on a regular basis.”
Neighbour Peter Kellythorn, 40, said there was a smell “like something might be smouldering” when he awoke on Thursday.
“I got dressed, came outside and there was smoke billowing out from the back window,” he said.
He added that a satellite dish on the house appeared to have melted, and said: “The heat – it doesn’t bear thinking about.
“We hoped everyone had got out.
“They’re fairly new houses and they’re all fitted with fire alarms and things.
“It’s just awful.”
A GoFundMe page set up by a neighbour with a target of raising £1,000 for the family had reached more than £3,000 by Friday lunchtime.