Alarm warning over fire exercise in Telford
One in five smoke detectors checked after house fires was not working, Shropshire's fire service says.
The figures were revealed as the service staged a mock fire in a semi-detached house in Donnington, Telford.
Using actors, it aimed to show how quickly smoke spreads at the empty Wrekin Housing Trust property.
About 67% of homes where fires occur in Shropshire have a smoke alarm, but the number of non-working detectors increased last year from 12% to 20%.
Firefighters and ambulance staff arrived at the scene as smoke billowed out of windows during Thursday evening's initiative.
Other organisations involved included police and Telford & Wrekin Council.
Organiser Ian Leigh, from Wellington fire station, said: "People are unaware that you are more than twice as likely to die in an accidental house fire if you don't have a working smoke alarm."