Officers from the West Covina Police Department received a call regarding a robbery in progress around 7:30 p.m. at Kevin Jewelers in the Plaza West Covina mall at 112 Plaza Drive, Sgt. Matt Nelson told City News Service.
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"After entering the store and breaking the display cases, the three suspects ran out of the store with a large quantity of jewelry to a waiting car," Nelson said.
The sergeant noted that there was an initial report of shots fired, but police later determined it was the sound of glass being smashed.
Investigators tell Eyewitness News three suspects seen wearing hoods and ski masks robbed the jewelry store using hammers. They said they took off and jumped into a waiting vehicle.
No injuries were reported.
Officers were at the mall investigating as crime-scene tape blocked off the jewelry store.
The sound of glass getting shattered prompted panic among shoppers. Witnesses say people ran from the mall and others sought shelter in nearby stores.
City News Service contributed to this report.