Police are appealing for help to find a teenager last seen leaving a nightclub in Windsor.
Marnie Clayton, 18, from Bracknell, left Atik in William Street at about 2am on Sunday, Thames Valley police said.
She did not return home and was reported missing by her family shortly before 3am.
Clayton is described as white, 5ft 2in to 5ft 4in tall, with brown hair and a slim build.
The teenager, who was wearing a grey dress when she was last seen, is also known to frequent Reading town centre.
Police released photographs of Clayton, including one taken on the night she went missing.
DCI Jon Groenen said: “This is out of character for Marnie, and we are becoming increasingly concerned for her welfare.”
He appealed to anyone who knew of her whereabouts to contact police.
“I would also like to appeal directly to Marnie: if you see this appeal, please contact your family or the police to let us know you are safe and where you are," él dijo.
The force tweeted: “We would like to thank you all for your concern and for sharing our appeal to help locate Marnie. [Ella] is still missing at this current time, and we would ask you to contact us if you have any information that can assist the investigation.
“We would like to reassure the community that this is a fast-moving inquiry, and we are thoroughly investigating the circumstances. Please avoid speculation into the circumstances but share any information you feel may assist the investigation by calling TVP on 101.”