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Holidaymakers have been warned by police to only use official airport parking companies after vehicles suffered suspected criminal damage and were left with "unexplained additional mileage".
Avon and Somerset Police (ASP) said it held a day of action targeting unofficial parking firms operating near Bristol Airport.
Some customers' cars were involved in parking and driving offences while they were on holiday or were driven by people suspected of being uninsured, police said.
Others were also given back to their owners in an "undriveable or unroadworthy" condition, police added.
The operation was held on 3 June and involved North Somerset Council, the Immigration Enforcement Team and the Motor Insurance Bureau.
