Everything we know about Dr Michael Mosley's disappearance as Symi search continues

The search for missing TV doctor Michael Mosley is now continuing into its fourth day. The broadcaster, journalist and author was last seen on a coastal path while on holiday with his wife, Dr Clare Bailey, on the Greek island of Symi on Wednesday afternoon.

The 67-year-old disappeared after failing to return home from a walk and does not have his phone with him.

Here is everything we know so far about his disappearance. You can follow our live blog as the search continues here

The couple are staying in the Pedi region of Symi, a Dodecanese island about 25 miles north of Rhodes. On Wednesday afternoon, Dr Mosley and his wife were with another couple on Agios Nikolaos beach when he set off on a walk on his own to the centre of the island.

READ MORE: Dr Michael Mosley's wife releases statement and says 'we will not lose hope'

The walk should have only taken around 20 minutes but six hours later Dr Mosley failed to return home, prompting his wife to raise the alarm. He had not taken his phone with him, and it is unclear from reports whether he left it at the beach or in his accommodation.

Dr Mosley was last seen on CCTV the main road of the town Pedi at about 1.50pm on Wednesday, about 20 minutes after he is believed to have hiked a coastal route. There had been suspicion he might have fainted or fallen off a cliff during a walk.

Friday afternoon - Symi deputy mayor, Ilias Chaskas, confirmed 'divers are looking in the water', and the local coast guard have joined the rescue efforts.

There has been a major response to Dr Mosley's disappearance. The operation was initially focused on the vicinity of the coastal path where he was last seen, but has since been expanded to other parts of the island.

Police officers