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A man died and a woman was seriously injured when the roof of a house collapsed.
The pair were in a bedroom at their home in Knight's Fold, Bradford, when debris fell on them in the early hours of the morning.
The man, 47, died while the woman, 28, was taken to hospital. Her injuries are not thought to be life threatening.
A family from a neighbouring property, including three children, were taken out of their house unhurt.
Det Insp Claudine Binns said work was under way to make the building safe and it had launched an investigation with Bradford council to determine the cause of the collapse.
She said the family in the adjoining house would be rehomed with the authorities "working to support everyone involved in any way we can".
Emergency services were called just after 05:00 BST to reports of a "structural collapse".
Road closures are now in place in the area while police officers, firefighters and structural engineers carry out work.
Officers from West Yorkshire Police are preparing a file for the coroner.
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