The robbery occurred shortly after 5:30 p.m. at the Alexander Jewelers in the 12500 block of South Main Street, according to the San Bernardino County Sheriff's Department.
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No injuries were reported, and the estimated value of the stolen property was unclear.
A description of the suspect or suspects, who remained at large, was not available.
Smash-and-grab burglars target high-end sneaker store at Westfield Valencia Town Center
Smash-and-grab burglars target high-end sneaker store at Westfield Valencia Town Center
The robbery comes less than two weeks after Gov. Gavin Newsom said he would seek more than $300 million in state funding over three years to boost law enforcement efforts to combat retail theft.
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"The issue of crime and violence is top of mind all throughout not only the state of California but across the United States, highlighted recently by some high-profile retail theft operations," Newsom said.