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,

Santorini, a popular tourist destination in Greece, was put on a on high alert following a series of over 200 undersea earthquakes between Santorini and another Greek island Amoros, in the past four days.