Police and rescue teams are searching for the niece of a member of the Scottish Parliament who is missing on the Isle of Wight.
Rosie Johnson, 22, from Glasgow, was last seen on Sunday at an adventure centre in Wootton, where she works.
Daniel Johnson, MSP for Edinburgh South, has urged anyone with information to contact police.
She is described as slim, with mousey brown hair and was last seen wearing a dark blue puffer jacket and trousers.
Insp Andy MacDonald, of Hampshire Constabulary, said he has "serious concerns" for the welfare of Ms Johnson, who works at the children's adventure holiday centre, PGL Little Canada.
"Information suggests she is still on the island, so this is where we are focusing our search," he said.
Insp MacDonald added residents would notice "a lot of activity" in the area.
"It's not the easiest of areas to search - we have a number of water features, there's wooded areas, there's also open areas - so in terms of geography it's quite challenging," he said.
Ventnor Search and Rescue (SAR) said its specialist mud rescue teams were involved in a search of Wootton Creek close to Wootton Bridge, which crosses the water to Fishbourne and Ride.
People living nearby have been asked to check sheds, boats and outbuildings for Ms Johnson, who, according to her social media profiles, graduated from the University of Glasgow last year.
PGL Little Canada is an activity centre for primary school children on the north of the island.
It consists of woodland log cabins and is close to the banks of Wootton Creek, a tidal estuary that flows into the Solent.
A spokeswoman from PGL Travel said: "A member of staff working at our Little Canada site on the Isle of Wight did not report for work as planned on Monday morning.
"We were unable to establish their location and as a precaution informed the police who are now co-ordinating a search. We are providing any support we can to help with this."
At the scene
By Matt Graveling, BBC South Today reporter
Activities are continuing as normal at PGL Little Canada and children can be heard laughing - unaware of the large-scale search being carried out in the area.
About 40 police officers and rescue team members are concentrating their searches on Wootton Creek today, including along its banks.
House-to-house inquiries are also being conducted.
Hampshire Constabulary said Rosie's parents were being kept up to date with the search.
Coastguard teams said searches had been conducted from King's Quay, between East Cowes and Wootton Creek, to Ryde Pier, near the ferry port, and inland along Wootton Creek.
Anyone who has seen Ms Johnson, or who may have information, is urged to contact police "as a matter of urgency".