Sussex Police are becoming increasingly concerned for the welfare of a 14-year-old girl.
Natalia Acton was last seen on Wednesday, April 4 in Bohemia Road, Hastings.
The teenager has gone missing from Shoreham and is thought to be in the St Leonards/Hastings area.
Extensive enquiries have been undertaken to try and find her, but so far there have been no reported sightings.
A police spokesperson said: "Natalia has gone missing on many occasions in the past but due to her age she is very vulnerable and we are becoming increasingly concerned for her.
"We just want to know that Natalia is safe and well and would ask that anyone who knows where she is to call police immediately on 101.
"We would also urge Natalia herself to make contact with police."
Natalia has been described as white, 5ft 4ins tall, of average to large build, with long dark brown hair which is often in a ponytail.
When she was last seen she was wearing black leggings, a black and white flowery print top and a tan leather jacket. She had a light purple bag with her.