The suspects entered the Kay Jewelers store in Brea Mall, located at 1010 Brea Mall Road, just before noon.
The suspects fled the scene after the robbery.
Some callers reported hearing shots, but investigators determined it was the sound of the hammers hitting the glass.
The public was advised to avoid the Brea Mall area as police are investigating the robbery.
No further details were immediately available.
Captured on video: Thieves smash jewelry stores’ glass exhibits in central California shopping mall
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