Ford owners in South Wales are being warned to be on alert after 10 Focus cars were broken into and their CD radio units were stolen overnight on Monday.
Police said the vehicles were broken into in the Cogan area of Penarth, Vale of Glamorgan, in the early hours of Monday morning.
The crime spree saw the nearside front window of all the cars smashed and their stereo units taken.
Similar incidents have been reported in the nearby town of Barry, and officers believe that the thefts were sparked off by an urban myth that a chip in the radios can be used to decode satellite TV receivers.
Penarth Neighbourhood Inspector Chris Owen said: "We have seen similar spates previously, which are linked to an urban myth about the radios containing a special microchip.
"Experts have concluded the microchip cannot be used in this way and the thieves are wasting their time.
"But we need information about who is responsible for stealing these radios and where they are selling them.
"They are probably offering these radios for sale cheaply and would ask anyone who is offered a cheap Ford radio to decline and call us immediately."
Inspector Owen added he wanted to reassure the community his officers were doing all they could to bring the thieves to justice and were laying on extra patrols in the affected areas.
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