At least one tourist was injured on Thursday following a rockfall at the Navagio beach in the island of Zakynthos, Greek coast guard and police officials said.
British holidaymakers have described scenes "like Dunkirk" after tons of rock fell from a cliff face onto a packed tourist beach on the Greek island of Zante.
Navagio is one of Greece's most popular beaches, taking its name from the remains of a cargo ship that was wrecked there almost 40 years ago.
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The other three people injured were treated and released.
Coast guard officials told the Evening Standard that those hurt had not sustained any life-threatening injuries.
Footage posted on social media showed people running in panic as a large section of the cliff peeled off and crashed down close to several bathers.
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A Czech woman suffered back injuries and was transferred to hospital, a coast official said.
O'Connell described the piece of rock that fell as being as big as a four-storey building, crashing down onto the beach. Meanwhile, some boats were capsizing in the strong waves. Rescue services employed sniffer dogs to search the beach itself for possible victims of the rockfall.
Two small boats just off Navagio beach - nicknamed "Shipwreck Beach", after a freighter shipwreck in 1980 - also capsized as a result of the rockslide.
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Lynette Bridges, 58, was on a tour boat, pulling up to "Shipwreck Beach" as the incident happened.