A woman remains in a critical condition after being injured in a house fire which claimed the lives of her three children.
Three-year-old Maddie Hudson, Anthony Hudson, five and William Beale, nine, died in the blaze in Clarence Avenue, Bridlington on Thursday night.
Samantha Hudson, 27, was rescued from the house and is critically ill in Scarborough hospital.
Police said there was nothing to indicate the fire was deliberate.
However, Ms Hudson had returned home late on Thursday evening and officers now want to establish where she had been before the fire started.
Fire crews and police were called to the cul-de-sac, which is just a short walk from the beach, at 2358 GMT on Thursday.
Neighbour and nurse Lesley Salisbury, 59, said she helped perform first aid on the youngsters.
She said she ran out in her dressing gown after she was woken in the night, but first thought smoke filling the street was fog.
She said: "I saw flames coming from the bottom of the house and I ran out.
"To be honest I just can't remember getting from my house to there. But a firefighter brought out a little boy.
"I told him I was a nurse and I started to work on him. I think I just went into nurse mode.
"I was doing chest compressions and the firefighters were doing the oxygen.
"After that it was just a blur, a dreadful blur."
Another neighbour, Susan Smith, said she heard screams from the children next door and her husband tried to get in the back until he was dragged away.
Mrs Smith said the children played with her grandchildren.
She said: "I could hear them screaming. It was terrible.
"My husband tried to get in but the fire was so fierce. I've never seen anything like it."
Supt Mike Duggleby, of Humberside Police, said: "Police, fire service and forensic experts are investigating the cause of the fire.
"I can say that we believe the fire started within the house and there is nothing to indicate that it was started deliberately."
On Friday people living in the area continued to leave flowers in front of the house.