Have you seen 13-year-old Jessica Pusey?
She has not been seen since she left her home in Warren Drive, Crawley, late on the evening of Thursday July 3 or in the early hours of Friday morning.
The schoolgirl was reported missing on Friday morning but officers have been unable to make contact with her.
Jessica is 5' 3" and has brown shoulder-length hair and blue eyes. When she was last seen she was wearing a black top, black leggings and white shoes. She was carrying a black handbag.
PC Lee Simmonds said: "We are concerned for Jessica's welfare because of her age. It is not the first time she has gone missing but we need to speak to her urgently to make sure she is ok.
"We know she has friends in Brighton and Hove so it is possible that she is somewhere in the city."
Anyone with information should call 101 quoting serial 17 of 4/7, email firstname.lastname@example.org or call the independent charity Crimestoppers anonymously on 0800 555111.