Residents and tourists on the Greek island of Santorini have been put on high alert after an increase in seismic activity.

Greek Prime Minister Kyriakos Mitsotakis has urged people on the island of Santorini to "stay calm" after an increase in seismic activity. His remarks come as schools were told to close on Monday and authorities advised against large gatherings in enclosed spaces across the island,

Thousands of residents, seasonal workers and tourists have left Santorini and its neighboring islands after a spike in seismic activity since Jan. 31.