LAKEPORT, Calif. – Police and firefighters have secured the location of a Lakeport business following the discovery Thursday morning of an explosive device.

Lakeport Police Lt. Jason Ferguson said police were notified of a suspicious package at the UPS customer service center at 1275 Craig Ave.

Police believe the device, discovered by UPS employees, is an inert mortar that was being shipped to a Clearlake resident, Ferguson said.

An employee moved the mortar to a nearby field, which Ferguson said has been cordoned off in preparation for the arrival of the Napa County bomb squad.

He said the business is being allowed to remain open.

Ferguson said the situation remains under investigation, and additional details will be offered as they become available.

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Correction: The article originally stated that the package recipient was a Lakeport resident. Ferguson later clarified that the recipient was from Clearlake.