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After a four-day search, Greek officials said on Sunday they had found the body of Michael Mosley, a British medical journalist and documentary maker who disappeared last week while on a trip on the Greek island of Symi.

His body was found on a beach in Agia Marina, said the mayor of Symi, Eleftherios Papakalodoukas.

His disappearance had prompted an extensive search that called in firefighters, police officers and volunteers. The authorities also used dogs and drones, and the Greek coast guard also joined the effort as fears escalated that Dr. Mosley had drifted out to sea.

A spokeswoman for the Greek police, Constantina Dimoglidou, said the mayor, who was on a boat patrolling the coast with reporters from the state news television channel Ert, spotted Dr. Mosley’s body and recognized his blue shirt from the last pictures of him captured on security cameras.

Dr. Mosley, 67, a BBC journalist, had arrived on Tuesday on Symi, part of the Dodecanese islands in the Aegean Sea, for a weeklong trip. He told friends at Agios Nikolaos beach on Wednesday afternoon that he would walk back to his accommodation in Symi town, the local authorities said.

The walk is about two miles, depending on the route taken. When hours had passed with no sign of Dr. Mosley, his wife, Clare Bailey Mosley, reported him missing to the police.

Search efforts shifted north, toward Agia Marina, on Friday after footage emerged from security cameras in the village of Pedi — about halfway between Agios Nikolaos and Symi town — showing what appeared to be Dr. Mosley carrying an umbrella.