At least seven people were injured in Greece on Thursday in a rockfall at the popular Navagio beach in the island of Zakynthos, Greek authorities said.
Navagio Beach, nicknamed Shipwreck Beach, is a popular tourist attraction in Zakynthos.
Coast guard and fire brigade officials confirmed that the injuries sustained were not life-threatening.
Footage of the incident, which took place at Navagio Beach on the isle of Zakynthos, shows tourists fleeing as the large sheet of rock breaks away from the cliff face.
One foreign woman was injured and transported to hospital, the coast guard said, adding that the beach was evacuated and boats were banned from approaching the cove until further notice.
O'Connell described the piece of rock that fell as being as big as a four-storey building, crashing down onto the beach. Local media said witnesses reported a large rock initially fell from the cliff into the sea, creating a large wave that capsized small boats.
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The water hit his feet with such a strong force, it knocked him onto his back and went on to cover more than half the beach.
He described the aftermath as "chaos", with families and children running to get to safety on the boats.
"So far, we haven't found any trapped people but we will continue searching", a fire official told the news agency. Rescue services employed sniffer dogs to search the beach itself for possible victims of the rockfall.
The beach is also known as Shipwreck Beach.
Authorities later said everyone who had arrived at the beach on tourist boats had been accounted for.