Lancashire Fire said in a tweet units were called to a row of terraced houses on Mallowdale Avenue in the early hours of Sunday and that firefighters are searching a collapsed property.
"As a consequence of that a number of people have been injured."
“The information as we know it is that there are four persons that have also been injured in the incident, two of which are seriously injured and two others who remain under medical assessment.”
“Tragically a young child has been killed as a consequence of what has happened and the thoughts of myself and all the emergency services are with the family at what is a distressing time."
Ben Norman, the Assistant Chief Fire Officer of Lancashire Fire and Rescue Service, said that fire crews remained at the scene and an investigation into the cause of the blast would be carried out “slowly and methodically”.