Multiple earthquakes are rattling Santorini, a volcanic island in Greece, prompting authorities to dispatch rescuers with tents, a sniffer dog and drones, and to shut schools on four islands. Last week,

Thousands of people are fleeing the Greek island of Santorini as increased seismic activity spurs fears of a more powerful earthquake at the site of one of the largest volcanic eruptions in history.

The strongest earthquake recorded was magnitude 4.6 at 3:55 p.m. Sunday, at a depth of 14 kilometers (9 miles), the Athens Geodynamic Institute said.