A mother and young child had to be rescued by firefighters following an arson attack on a house in Farnley.
The incident occurred shortly after midnight in the early hours of Saturday (20 November) at a house in Butterbowl Mount, Farnley.
A rear window had been smashed and a fire started in the living room while the inhabitants were in bed upstairs.
Fire investigators believe the cause was deliberate and police are treating the incident as arson with intent to endanger life.
Detective Inspector Guy Shackleton, of Leeds District CID, said:
“This incident could easily have had more serious consequences and we are treating it very seriously.
“We are continuing to carry out extensive enquiries to establish the full circumstances and to identify those responsible.
“We would like to hear from anyone who witnessed anything suspicious in Butterbowl Mount or the immediate area around the time of the fire or who has any information that could assist the investigation.”
Anyone with information can contact Leeds District CID via 101 quoting crime reference 13210599474 or online via www.westyorkshire.police.uk/101livechat. Information can also be given anonymously to the independent charity Crimestoppers on 0800 555 111.