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,

Hundreds of people scrambled to leave the Greek island of Santorini by ferry Monday after an increase in seismic activity raised concerns about a potential powerful earthquake. (AP Video by Lefteris P