Viking Cruises cancels calls to Santorini in Greece following a series of earthquakes impacting the island and region.

Precautions were also ordered on several nearby Aegean Sea islands - all popular summer vacation destinations - after more than 200 undersea earthquakes were recorded in the area over the past three days.

The increase in seismic activity around the tourist island of Santorini is causing concern among officials, who have ordered schools to shut across the island and warned locals to drain their pools