Schools on four Greek islands will remain closed through next week as earthquakes continue to rattle the region.

Schools on four Greek islands will remain closed next week as a series of earthquakes continue to shake the region, authorities said on Saturday. Santorini, Amorgos, Anafi, and Ios have experienced more than 800 tremors measuring magnitude 3 or higher since 1 February.

A state of emergency was declared on Santorini Thursday after a magnitude 5.2 earthquake shook the Greek island late Wednesday. The tremor is the latest — and strongest — in a series of quakes that have struck the island since last week,