A mortar round was found late Tuesday in a vehicle at a gate to the sprawling Pearl Harbor military base, shutting down the base for hours and leading three people to be taken into custody.

Joint base security responded to the reported shooting at the Pearl Harbor Naval Shipyard, officials at the base said. The base was on lockdown for several hours Wednesday afternoon.

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The base went into lockdown around 2:30 p.m. when the first active shooter reports were received. The base reopened a few hours later. Witnesses were still being interviewed hours after the shooting.