Thieves smashed a window at Kay's Jewelers at Napa Premium Outlets and made off with an undetermined amount of merchandise, Napa Police reported.
The burglary occurred shortly after 3 a.m. Tuesday, setting off an alarm, police said.
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A store video showed three suspects entering Kay's at 3:02 a.m. and departing five minutes later after ransacking the store, police said.
Police said they are continuing to investigate the break-in and look for possible evidence.