Access to vehicles can now be gained by redirecting the wireless signal from a key fob.
Thirty five cars have been stolen using “clever technology” over the last 11 months, police said.
Detectives believe an organised crime group could be behind the recent spate of mostly high value cars.
They have warned that the cars targeted are usually “extremely expensive, so the loss is great”.
Earlier this year, a purple BMW M4, registration number R50 0LAN, was reported stolen from Mourne Manor in Strabane shortly before 9am on 4th March.
The car belonged to the partner of SDLP West Tyrone MLA Daniel McCrossan.
Earlier that week, a white BMW X5, registration number CD0 8ETH, was reported stolen from Glenview Manor in the town.
Police believe the vehicles may have been taken across the border into Donegal
Said Detective Inspector Bell: “With advances in technology, thieves are now able to gain access to your vehicle by redirecting the wireless signal from your key fob. They only need to be within a few metres of your car key to get the signal, even if it’s inside your home.
“We are urging the public to be vigilant, especially those with keyless entry cars.”
Police said owners can help prevent thefts by taking a number of precautions, including keeping car keys, including spares, away from the car, doors and windows when at home.
Motorists are also advised to put keys in a signal-blocking pouch, such as a Faraday Bag, turn off wireless signals on your fob when it is not being used.
Keyless car entry systems let drivers open and start their cars without taking their key out of their pocket.
Thieves, normally working in pairs, will target a car parked outside a house.
One criminal will hold a device close to the car that boosts the signal meant for the key, while the other thief will stand close to the house with another device that relays that signal to the key, fooling the system.
Detective Inspector Bell added: “Don’t let thieves get an easy ride this summer. If you know someone who is stealing cars, or helping someone who is, please report to us on 101 or 999 in an emergency.
“You can also come forward with any information you may have totally anonymously via CrimeStoppers on 0800 555 111.”
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