A man and woman reported missing from Fife may have travelled to Edinburgh together.
Police said Keiran Elston, 20, and Jamie-Lee Rennie, 21, were seen getting on a Dundee-bound bus outside Leuchars station around 1.15pm on Tuesday.
It is believed the pair may have then travelled to Edinburgh city centre.
Keiran is described as around 5ft 10ins, of slim build with brown hair and green eyes. When last seen he was wearing a peach coloured hoodie and a black jacket.
Jamie-Lee is described as around 5ft 2ins, of slim build with long red/auburn hair. When last seen she was wearing a long t-shirt, shorts and opened toed shoes.
Inspector Murray Gibson said: “Concerns are growing for the welfare of both Jamie-Lee and Keiran and I am asking anyone who has seen them or knows where they might be to get in touch with us.
“Likewise, if they hear about this appeal, I am asking them to please contact us to let us know they are safe and well.
“Anyone who can assist should contact Police Scotland on 101.”