A 37-year old Wakefield man has now been arrested in connection with the incident and is currently being held in police custody.
Isobel Dobson, aged 2, died during the serious fire at Hessle Farm, Wragby on Friday evening (30th Sept). On arrival Emergency services found two barns were ablaze as well as a van that was parked nearby.
Enquiries into the cause of the fire, which is now being treated as suspicious, are ongoing and a joint investigation is being carried out by West Yorkshire Police and West Yorkshire Fire and Rescue Service.
Police are appealing for any witnesses, or anyone with information that they feel could assist the investigation, to contact the Homicide and Major Enquiry Team via 0845 6060606 or Crimestoppers anonymously on 0800 555 111.