A magnitude 4.7 earthquake struck the Campi Flegrei area near Naples, southern Italy, leaving dozens injured, causing power outages, disrupting train and metro services, and damaging some buildings.

At least 26 people were injured, according to Italian media.

About 300 people evacuated from their homes after the quake triggered landslides near the Phlegraean Fields, a large volcanic area west of Naples

Italy’s civil protection minister, Nello Musumeci, urged caution and warned that the volcanic activity was not yet over.

At least five of those injured were taken to hospital and about 300 people were evacuated from their homes in the city of Pozzuoli, near the epicentre of the quake.

Many residents spent the night on the streets, afraid their buildings would be damaged or collapse.

The tremor, recorded at 7:46 p.m. (1746 GMT) on Friday, had its epicentre west of Naples, at a depth of about 3 km (2 miles), Italy’s National Institute of Geophysics and Volcanology said.

Italian media reported it to be the strongest quake to hit the region in the last 40 years and caused part of a cliff and several unoccupied buildings to collapse.

The Italian fire service confirmed minor building damage in and around Naples, though no immediate rescue requests were received. Local rail and metro services were suspended as a precaution.

Campi Flegrei, a densely populated volcanic caldera west of Naples, has seen increasingly frequent seismic activity, prompting government monitoring.

Small quakes are common, but stronger tremors heighten fears of a repeat of the 1980s seismic crisis, which caused widespread disruption and displaced thousands from their homes.

Italy is prone to seismic events, with a history of powerful quakes.

A series in central Italy in 2016 killed around 300, while the deadliest in recent decades was a magnitude 6.9 quake in Irpinia in November 1980, claiming about 2,700 lives.