UPDATE: Riverside mall locked down after smash-and-grab robbery

Police locked down a shopping mall in Southern California after three robbers smashed the counters of a jewelry store, setting off panic as shoppers confused the sound of breaking glass with gunfire.

Police in Riverside said the robbery inside the Galleria at Tyler mall triggered a large police response Sunday evening because of initial reports of a shooting.

Police said shoppers had to stay put for about an hour as officers investigated. After they determined the suspects had fled the mall, officers went store to store to ensure that no one inside got hurt and let everybody go.

Witnesses told the Riverside Press-Enterprise they saw people running and screaming as dozens of officers stormed into the mall.

Police had no information on the three male suspects.

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We are receiving reports of a heavy police presence at Tyler Mall in Riverside.

Officers are searching for three suspects tied to an attempted jewelry store robbery, according to reports.

We are also tracking down reports that the mall maybe locked down. We have received no reports of any shots fired.

Stay with News Channel 3 and CBS Local 2 for the latest on this developing story.