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A 4.0-magnitude earthquake shook Italy's volcanic region of Campi Flegrei west of Naples last night as shocked residents posted videos of cars being pelted by rubble amid the worst of the tremors.

The quake - the latest in a series of tremors this past week - caused panic among residents who spilled out into the streets amid fears it could be the prelude to a volcanic eruption.

The area around the Campi Flegrei (Phlegraean Fields) volcano, which last erupted in 1538, has been the scene of increased seismic activity in recent days with a series of tremors.