Fourteen cars were broken into or were left unlocked in Cork over the weekend.
It has led to a renewed appeal from gardaí for people to lock their vehicles outside their homes at night.
Gardaí said "We had 14 cars broken into in the Cork North Garda Division between Friday evening and Monday morning. The worrying part is that most of the cars were left unlocked."
On average, over €340,000 worth of property was stolen from vehicles each year in Ireland.
Property stolen includes cash, laptops, tools, sunglasses, jewellery and sports equipment.
Gardaí are appealing for all vehicle owners to ensure they lock their vehicle no matter where it is parked.
"Do not store valuables in the car, but if you do have to, keep them out of sight."
There have been repeated incidents across Cork in recent months of thieves moving through estates in the early hours of the morning checking for unlocked cars.
National crime figures show that 38% of all vehicles broken into were left unlocked and that driveways are a common location for these thefts. More than 50% of these thefts occur overnight between midnight and 7am.
Sgt Kelvin Courtney from the Garda Crime Prevention National Centre of Excellence said: "Wherever you park your car or van, we would always advise you to take your property with you and ensure the vehicle is locked, alarmed and parked in a secure, well-lit location."
"We’ve even seen cases where two vehicles from the same household were unlocked and broken into."
"Sometimes it is impractical to remove tools and equipment from vehicles. In these cases, owners should take extra steps to ensure the safety of their property. Additional locking mechanisms to vehicles should be fitted. Consider a monitored vehicle alarm and tracking devices for valuable property. Reduce the payoff to the thief by marking and photographing the property and take a record of serial numbers, makes and models.”