CCTV video shows the moment a gas machine prevented a burglary by filling the site of the incident with thick smoke.
Two men broke into a business in Corby, Northamptonshire, by smashing the glass doors of the property.
But their plans were foiled as the security system rapidly emitted the smoke, impairing their vision.
The security system was installed by Northamptonshire Police, who released the footage and commended the “extremely effective” crime prevention method.
“If offenders can’t see it, they can’t steal it,” said crime prevention team leader Paul Golley.
“In light of recent commercial burglaries, we have been working with businesses across Northamptonshire to talk about the range of crime prevention equipment they can utilise to prevent burglars from destroying their livelihoods.
“Make sure to remove anything valuable from view and lock it away in a secure place overnight.”