St. Charles police responded to 11 calls about vehicle burglaries Thursday morning.
The calls came from both sides of the city, according to police.
Police said the incidents occurred on Lewis Court, Stonehedge Road and Dunham Place on the northeast and Timbers Trail, Timbers Court, Timbers Circle and Carrol Road on the near west side of town.
All the incidents occurred between midnight and 3 a.m. and involved vehicles that were left unlocked by their owners.
The stolen items included a GPS unit and small amounts of currency and coins.
Police are urging residents to lock their cars and not leave personal property inside the vehicle.
Anyone with information regarding the break-ins can call the St. Charles police at (630) 377-4435.
A reward will be offered for information leading to an arrest. Confidential information can also be left on the city's website at www.stcharlesil.gov/report-crimedrug-tip.