Two thieves stole catalytic converters from five white vans during a crime spree last week.
The two men first targeted a white Mercedes sprinter van in Walnut Tree Lane in Sudbury between 4pm on Wednesday and 7.30am the following day.
The second theft took place in an industrial unit on Chilton Airfield in Great Waldingfield.
Between 6pm on Wednesday and 10am the following morning the pair stole two catalytic converters from two Mercedes Sprinter vans.
Between 7.45pm and 8pm on Wednesday, thieves entered an industrial estate and stole catalytic converters from two Mercedes Sprinter vans parked in a business park in Drury Drive.
Police have released a description of two men in connection with the thefts.
CCTV showed the duo arriving in a dark-coloured saloon car.
The first is described as wearing a black coloured hat, a jacket and a light-coloured reflective jacket.
The second is described as a man dressed in black clothing.
Police also issued a number of tips on preventing catalytic converter thefts, including the use of alarms, lighting and CCTV, as well as marking the metal shell with the vehicle’s registration number.
They advised people to be wary of anyone working under vehicles, as they may not be the owners or leaseholders, even if they have fluorescent jackets on.