A mother and five of her children have died after a fire swept through their home.
The family's father and a sixth child, a teenager girl, escaped the blaze in Neasden, north west London, in the early hours of Saturday but they remain in hospital.
The fire, which broke out at the house in Sonia Gardens at around 1am, is not being treated as suspicious, police said.
The victims have been named as Muna Elmufatish, 41, teenage daughters Hanin and Basma, 14 and 13, nine-year-old daughter Amal, and sons Mustafa and Yehya, aged five and two.
Father Bassam Kua, 51, and 16-year-old daughter Nur escaped from the house. He is said to be in a stable condition, while she is described as critical.
Metropolitan Police said the fire had been deemed "non-suspicious" after an investigation by officers and the London Fire Brigade.
Chief Superintendent Matthew Gardner said a "thorough and painstaking" investigation is being carried out into the cause.
Mr Gardner also said officers will be conducting "reassurance patrols" in the area and places of worship, as well as liaising with schools to update local children who may have known the children of the family.
Emergency workers were called to the semi-detached property in Sonia Gardens in the early hours after the blaze took hold of the ground and first floors. One neighbour described hearing a loud bang, almost like an "explosion".
A London Ambulance Service spokeswoman said four of the children and their mother were found dead at the scene. Medics tried to resuscitate five-year-old Mustafa, who was in cardiac arrest, but could not save him.