A rash of thefts from parked unlocked vehicles prompted Nassau County police on Friday to urge residents to lock their vehicles and, if possible, keep them in their garages.

Police said there has been an “increase in larcenies” but did not provide an exact time frame or a specific list of communities where they were occurring.

In an advisory police said the they were happening at all times and throughout the county.

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They offered suggestions to deter such thefts, including to always lock your vehicle, even if it is parked in the driveway, and to never leave a smart key inside a vehicle no matter where it is parked.

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Also, police said to roll up the windows, remove valuables from vehicles, take remote garage-door openers inside if the car is parked outside, and to keep the outside of residences well lighted.

Police also asked residents to be on the lookout for suspicious vehicles or strangers in the neighborhood.

Residents who suspect something can dial 911, police said, asking that callers be prepared to provide as much information as possible, including license plate numbers of suspicious vehicles.