Officers are urging people to be vigilant after catalytic converters were stolen from seven cars in Hertsmere this weekend.
The offences took place overnight between October 9-10, predominantly in Bushey and Borehamwood.
The vehicles targeted were Lexus models and Toyotas, specifically the Prius and Auris hybrid models.
Catalytic converter thefts have increased this year due to the precious metals they contain and the high metal prices, with thieves even trying to steal them on the roadside and in car parks, often during broad daylight.
Hertsmere safer neighbourhood inspector Rachael Robertson said: “This number of offences is obviously of concern and it’s something we are working to tackle, including carrying out additional patrols in hotspot areas. If your catalytic convertor is stolen it renders your car almost undrivable and can be incredibly costly to repair and replace.
“This summer, Hertfordshire Constabulary launched a new campaign, Operation Feline, to help drivers protect their catalytic convertors and to deter thieves. As part of the campaign certain garages across the county are offering a free security marking service and I’d urge residents to take up this offer.
“We would also urge the public to follow our advice, remain vigilant and report incidents of suspected catalytic converter theft, particularly where people are trying to get under cars in public car parks or on public roads. If you see this happening, please call 999 immediately.”
For more information visit herts.police.uk/operationfeline.