Police are hunting for a ring of thieves suspected of stealing 18 luxury vehicles from the streets and driveways of the Hamptons over the last few weeks.  

BMWs, Mercedes, Range Rovers and other late-model luxury vehicles have been stolen, many right from driveways and all taken after 10 p.m., so owners wouldn't notice until the next morning, police told NBC 4 New York. 

Some Suffolk County residents said the thefts are not surprising, considering the number of luxury cars parked in the area, many left unlocked.

"We do take a laid-back approach," said Sharon Goldstein, of Remsenberg. "Maybe now some people will begin locking their cars."

So far, the cars have been stolen in West Hampton, Quogue Village, Southampton and East Hampton. Police are offering a $5,000 reward for information that could break up the ring and lead to arrests. 

Police are asking car owners to make sure they lock their doors, roll up windows, set alarms and remove spare keys. Valuable items such as electronics and handbags should also be removed from unattended vehicles. 

Anyone with information about the thefts should contact the Suffolk County Crime Stoppers at 1-800-220-TIPS.