Greece on high alert as multiple earthquakes shake island of Santorini

A series of earthquakes near the Greek island of Santorini have led authorities to shut down schools, dispatch rescue teams with sniffer dogs and send instructions to residents including a request to drain their swimming pools.

Even though earthquake experts say the more than 200 tremors that have hit the area since early Friday are not related to the volcano in Santorini, which once produced one of the biggest eruptions in human history, locals are on edge.

The strongest earthquake recorded was magnitude 4.6 at 3:55 p.m. Sunday, at a depth of 14 kilometers (9 miles), the Athens Geodynamic Institute said. A few tremors of over magnitude 4 and dozens of magnitude 3 have followed. There were no reports of damage or casualties.