Two children aged three and five have died after a fire swept through a property in Preston, Lancs.
The boy and girl were rescued from the house on Friday but have died from their injuries.
The mother, aged in her 20s, suffered non-life threatening injuries.
A police spokesman said: "Our thoughts are with their loved ones at this incredibly difficult time.
"The children’s family continued to be supported by specially-trained officers."
A 24-year-old man was arrested on suspicion of arson with intent to endanger life. He was released under investigation pending further enquiries and has now been released with no further action.
He has now been released no further action.
Det Ch Insp Rach Higson, of the Force Major Investigation Team, said: “This tragic incident has resulted in two children sadly losing their lives and my thoughts, first and foremost, are with their loved ones at this time.
“Our enquiries into the cause of the fire are continuing.”
Anybody with information is asked to get in touch on 101, quoting log 1305 of April 8.
A joint investigation with Lancashire Fire and Rescue Service is being carried out to determine the cause of the fire.
More to follow...
