Concern is growing for the safety of a woman who went missing from a North Sea ferry during a crossing from Hull to Rotterdam.
Teresa Cowley, from Mickleover, Derby, was last seen heading towards the deck of the Pride of Rotterdam ferry in the early hours of Friday.
The 43-year-old's disappearance is being investigated by harbour police in the Dutch port of Rotterdam, who are liaising with Derbyshire police.
In a statement, Derbyshire police appealed for anyone with information about Cowley's whereabouts to come forward.
Cowley, who had no money with her when she went missing, boarded the ferry with her husband at about 8.30pm on Thursday.
After visiting a bar, the couple returned to their cabin but the door key did not work and Mr Cowley went to a reception area to resolve the problem, leaving his wife waiting outside the cabin.
The police statement said: "CCTV and witness accounts show Mrs Cowley go alone to a sun lounge on the ship shortly after 1am on Friday. Searches of the ship failed to locate Mrs Cowley, who has since been reported missing."
Cowley is described as white, of medium build, around 5ft 4ins. She has black, bobbed hair with red highlights.
She was last seen wearing a grey jumper, black leggings and black boots and has several distinctive tattoos, including the words "Mrs Cowley" written on her forearm. She has a tattoo of a black panther on one ankle, and a large tattoo on the right side of her body made up of a dozen roses joined together.
Although detectives from Dutch harbour police are investigating the disappearance, it is not thought that anyone else is involved or any criminal offence has taken place.
Anyone with information is asked to call Derbyshire police on 101 and ask to speak to Peartree CID.
Mr Cowley is now believed to have returned to the UK.