A 44-year-old man has been arrested on suspicion of murdering a woman who went missing more than 14 years ago.
Gemma Simpson, 23, from Leeds, disappeared in May 2000.
She told a friend she was catching a bus from the Harehills area of Leeds to the city centre but vanished.
West Yorkshire Police have confirmed a man has been arrested in Scarborough, North Yorkshire, and a property is being searched in the seaside town.
Detective Chief Inspector Adrian Taylor, from West Yorkshire Police protective services (crime), said: "A 44-year-old man was arrested in Scarborough last night on suspicion of the murder of Gemma Simpson, who went missing in Leeds in May 2000.
"An address in Scarborough is currently being examined as part of the investigation and the man remains in custody while our inquiries continue.
"We have notified Gemma's family and will be keeping them informed of any developments."
Speaking to the Yorkshire Evening Post last year, Miss Simpson's mother Linda Umpleby said: " It's unbearable. No mother should have to go through this.
"The frustration is so overwhelming you could scream."
She said: " I have had to live with this for 13 years and it cracks you up. I feel like she's there by my side all the time."