A teenage girl from Littlehampton has been missing since Sunday.
Michaela Covey, known as Kayla, was last seen at a friend's house in Pagham at about noon on August 3.
The 17-year-old, from Littlehampton, has not contacted family or friends since and police are becoming increasingly concerned for her safety.
She is white, six foot and very slim with shoulder-length blonde hair swept over to one side.
When she was last seen she was wearing grey tracksuit bottoms, a grey t-shirt, a hooded top and trainers.
PC Lee Simmonds of Sussex Police said: "This is very much out of her character for Michaela.
"She has never been out of contact with her family for this long and has no money or mobile phone with her."
Anyone with information should call 101 quoting serial 731 of 05/08 or email firstname.lastname@example.org.