A house fire in Tonypandy, which left one woman in hospital, is no longer being treated as suspicious by police.
South Wales Police said no further action is being taken against the 26-year-old man who was arrested in the wake of the incident.
One 28-year-old woman was taken to Morriston Hospital, where she remains in a critical condition, and three children were treated for smoke inhalation as a result of the fire.
Emergency services were alerted to the blaze on Tyntyla Road on Tuesday 21 September.
Police confirmed they had released the man who was arrested and they are not looking for anybody else in connection with the event.
Detective Chief Inspector Sarah Lewis, said: “This is a terribly sad and tragic incident which has left a young woman fighting for her life in hospital. Extensive enquiries which have been made over the past few days have enabled us to arrive at the conclusion that the fire was not the result of a criminal act.
"Our thoughts and prayers at this time are with the woman in hospital and her family."