The Greek island of Santorini has been rattled by a further earthquake.The latest quake, one of thousands to hit the volcanic island in recent weeks, is the strongest so far with a magnitude of 5.3.Medical staff staged a hospital evacuation drill as scientists said it is unclear whether the weeks of highly unusual seismic activity precede a larger quake.

A state of emergency has been declared in Santorini after the strongest earthquake was recorded in days of near-constant tremors, which have almost emptied the famous Greek tourist haven of visitors and residents.

The latest of hundreds of earthquakes have rattled the volcanic Greek island of Santorini after the strongest one so far with magnitude 5.3.