ESSEX, MASS. (WHDH) - A dangerous device discovered in Essex prompted the evacuation of that town’s public safety building.

Police said a person walked in with what they believed was an unexploded mortar shell.

The building was cleared out as a precaution and the bomb squad was called in.

The bomb squad said the device was not explosive.

Officials said if residents find a suspicious device they should leave it where it is and contact authorities.

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