A magnitude 4.7 earthquake struck Naples and nearby areas in southern Italy on Friday evening.
The tremor occurred at 7:46 p.m. local time.
Strong shaking was felt in Naples and coastal communities, prompting many residents to leave buildings and move into open areas or streets.
The Vesuvius Observatory said the epicentre was near Solfatara in Pozzuoli, in the Campi Flegrei area.
It placed the earthquake at a depth of about 3 kilometres, which contributed to the shaking being felt strongly.
Italy's Civil Protection Department said there were no immediate reports of major casualties or widespread damage.
The department said vulnerable buildings in Pozzuoli and Naples were being inspected as a precaution.
Some train and local transport services were temporarily suspended in affected areas while rail lines and other infrastructure were checked.
Geologists describe Campi Flegrei as a highly active volcanic region where gradual ground movement, known as bradyseism, has been occurring.
The Vesuvius Observatory said it was continuing to monitor the area and advised residents to remain alert for possible aftershocks.