Twenty-one vehicles were targeted over a seven-day period, with cash, paycards and a bicycle among the items taken during the incidents near St Mary’s Village. They took place between 15 and 21 February. No damage was caused to any of the vehicles.
There were also two similar thefts in St Peter and one in St Brelade.
Officers visited residents near St Mary’s Village to inform them of the thefts and have issued a warning to all Islanders not to leave valuables in their vehicles and to lock them when not in use.
DS Dave Hill said that there was no information on any suspects at this stage but the investigation was continuing.
He added: ‘We would appreciate anyone with access to CCTV, particularly in St Mary’s Village, to come forward. We are also appealing to potential witnesses who may have been walking around St Mary’s Village during the evening and night of Thursday 18 February and Friday 19 February who saw any other people or thing unusual.’
St Mary Constable John Le Bailly said the parish was assisting the police with the investigation and warned Islanders not to be complacent.
He added: ‘I urge all members of the parish to lock their cars and take any valuables they may have out of their vehicles.
‘It is too easy to be complacent in Jersey, especially in the countryside, where people may think it is OK to leave their cars unlocked. You should always choose the safest option and lock your car.
‘Always try and park in a lit-up area, as it helps identify people who may be trying to get away with stealing things in the dark.’
Sabrina and James Sherry, who live on Clos des Buis in St Mary, had their bike stolen and £10 was taken from Mrs Sherry’s car last Thursday night.
Mrs Sherry said her husband had noticed his van door was unlocked and the glove compartment was open when he left the house for work on the Friday morning.
‘We were really shocked when we found his van was open. My husband then checked my car and noticed that my emergency £10 which I leave in my car for when I go to the shops was missing. None of my husband’s work tools were taken, so they were clearly after money.
‘We then noticed the bike which James’s dad uses when he visits from Ireland had gone missing.
‘It is an old bike, so we don’t usually lock it up.’
Mrs Sherry said the family had become complacent about locking their vehicles.
‘We live on a really quiet green lane, which we thought was safe.
‘Clearly the darkness of the lane has played into the thief’s advantage, as there are no street lights.
‘I think this really highlights that you can never be too safe and should always lock your vehicles and secure your belongings.’
Anyone with information should contact the States police on 612200 or contact Crimestoppers anonymously on 0800 555111.