The disappearance of a university student who has not been seen for four days has been described by police as "very out of character".
Megan Roberts, 20, was reported missing by her mother this morning after a friend raised concerns, North Yorkshire Police said.
Officers said Miss Roberts, who is a student at York St John University and originally from Wetherby, West Yorkshire, has not been heard of since she went on a night out in York city centre last week.
A force spokeswoman said she was last seen at around 2am on Thursday in the Popworld bar, on George Hudson Street, having gone out with friends on Wednesday evening.
She said: "Nobody has heard from Megan since, which is very out of character and officers are very concerned for her safety.
"Police are appealing for anyone who has seen Megan since the early hours of Thursday morning or knows where she is now, to contact them urgently.
"They are also appealing to Megan herself to contact her friends, family or the police to let them know she is safe."
Miss Roberts is described as around 5ft 6in tall, of medium build with long dark brown hair. When she was last seen she was wearing a cream knee length dress which had large brown and orange flowers on it and black plimsolls-type shoes.