Three people have been arrested on suspicion of child abduction following the disappearance of a 14-year-old schoolgirl.
Police said they were now treating Chloe Newman as a "high-risk missing person" after they quizzed a 33-year-old woman, a boy of 16 and a 22-year-old man.
The trio were questioned and then all released on police bail until April 11 as officers from Sussex Police carry out further inquiries to find her.
The last confirmed sighting of Chloe was of her getting into a black car at Haywards Heath railway station in West Sussex at 2.50pm on January 7.
Several people have told police they think they may have seen her since then, but none of the sightings have been confirmed.
Sussex Police said the three suspects, all from Newhaven, East Sussex, were arrested yesterday by officers searching for the teenager.
Detectives are also searching a home in Gibbon Road, Newhaven, as appeals were made for anyone who spots her to contact police urgently.
Detective Inspector Gavin Patch, of Sussex Police, said: "Chloe has been missing for more than a week and we are becoming increasingly concerned about her welfare.
"We are now treating her as a high-risk missing person because of her age, the length of time she has been missing and the fact that she has been associating with older people."
When she went missing, Chloe was wearing a pink hooded jacket with black sleeveless jacket, black trousers, blue Vans and large curtain ring earrings.
She is slim and had her long blonde hair up in a ponytail.
Anyone with information is asked to call Sussex Police on 101, or Crimestoppers on 0800 555 111.