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. Residents have been warned to avoid indoor gatherings,

Experts say the Greek island of Santorini has been hit by more than 1,000 earthquakes, but they're not linked to the region's active volcanoes.

Schools on the Greek island of Santorini have been forced to close after reports of "seismic activity". Tremors reaching up to 4.9 in magnitude were recorded northeast of the island on Monday, with recent days also seeing quakes of 4.3 and 3.9 magnitude reported in the vicinity.