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Virginia Beach, Va. – Police say they still have not determined why a Virginia Beach city worker opened fire on his co-workers, killing 12 people in a May 31 mass shooting.

The findings were released Tuesday evening during a City Council meeting.

Police said DeWayne Craddock opened fire hours after submitting his resignation as an engineer in the city’s public utilities department. The 40-year-old Craddock died in a gun battle with police.

Deputy Police Chief Patrick Gallagher says investigators are still working to find a motive for why Craddock opened fire.

He says there were no documented instances of Craddock being threatening in the workplace prior to the massacre.

A security firm hired by the city is continuing to conduct an independent investigation into the shooting.

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