The wife and brother of a British man who is missing in Indonesia have flown to Bali to help search for him.
Jeremy Hoyland, 41, of Penistone, South Yorkshire, travelled to the island as a race official in the Asian Beach Games.
But the father-of-two has not been seen since going on a sea scooter ride to nearby Nusa Lembongan islet on Friday.
His wife, Jacqui, and brother Nicholas have now joined the search. Meanwhile a family friend has offered a $10,000 (£6,380) reward for his return.
Mr Hoyland and four of his friends travelled to Nusa Lembongan on borrowed sea scooters.
He had planned to return to Bali's Tanjung Benoa beach a few hours after the others to preside over a sea scooter race.
He sent a text message from his mobile phone about five hours after his friends returned to say he was about two miles from the beach and needed help.
"There is still no news, and no sightings yet - but we are optimistic"
Rescue co-ordinator Heru Taryoto told the AFP news agency: "Extensive air and sea search operations have so far failed to locate Mr Hoyland and his red Yamaha Jet ski."
He added the authorities had urged people in Bali, Lombok, Nusa Penida and small neighbouring islands to help with the search.
Family friend Jonathan Oddy said Mr Hoyland had more than 10 years' experience using sea scooters.
'Limited resources'
He added: "They have been searching extensively for him. There is still no news, and no sightings yet - but we are optimistic. There are plans for another air search soon.
"They have examined the local area but have told Jacqui and Nicholas they will now go further afield."
"Clearly at some point the local authorities will stand the search down - but if that happens then we will considering chartering an aircraft and carrying on privately.
"They are doing their best - but the resources are a lot limited compared to what you would have in the UK and the culture is a lot different too."
In June, British divers Charlotte Allin, James Manning and Kathleen Mitchinson were rescued off the country's eastern coast after going missing for two days. And Mr Oddy said it was cases like this that gave him hope.
He said if Mr Hoyland, who works for engineering company SB Components, was stranded on a smaller island, it could take a while for him to be found. He could have run into heavy waves, Mr Oddy added.
Mr Hoyland had been invited to the games because of his expertise in the field. A former competitor, he had been on the board of the British Jet Sport Racing Association.
Another family friend, Scott Frazier, executive director of the International Jet Sports Boating Association, of which Mr Hoyland was an official, has offered a reward for his safe return.
Others have also pledged money to a search fund.
The Foreign Office is in contact with Indonesian authorities and is providing consular assistance to Mr Hoyland's family.
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