The search for a missing 15-year-old schoolgirl who fled to France with her maths teacher has widened.
Police believe Megan Stammers and Jeremy Forrest, 30, may no longer be in France and said there have been no confirmed sightings of the pair.
Sussex Police said it was working with Interpol and the French authorities over the disappearance of Megan, 15, and 30-year-old maths teacher Jeremy Forrest.
But BBC News reported Interpol was unable to confirm that it was working on the case of the missing schoolgirl from Eastbourne, East Sussex.
Neither she nor Forrest has a profile on the crime agency's website, www.interpol.int, under its "yellow notices" section which "help locate missing persons, often minors, or to help identify persons who are unable to identify themselves".
Mr Tingley said they were working with Interpol, a liaison officer in France and the French Missing Persons Bureau, plus other law enforcement agencies in Europe.
Officers believe friends might know where Megan and Forrest might be and Mr Tingley said they should not feel scared of divulging information not previously disclosed.
A report by the Daily Mirror today suggested the pair had been quizzed by police and had their phones seized before they fled to the continent.
The father of 30-year-old Forrest told the Daily Telegraph he was "worried" about his son "in case he flips".
The 15-year-old's mother and stepfather said they were unaware of any relationship but added that Megan had been receiving extra-curricular maths lessons since before the summer.
Megan's stepfather Martin Stammers, 43, told The Sun that he worked with Forrest two years ago at The Causeway School in Eastbourne, where he teaches.
Concerns about Forrest's relationship with Megan were first raised in February following a school trip to Los Angeles.
A friend of Megan's said another classmate raised the issue after seeing the pair holding hands together on the return flight and they would often hug each other, the Daily Mail said.
East Sussex County Council confirmed it and school officials were "addressing and investigating concerns" that were raised about the closeness of Megan and Forrest.
As the search for Megan continued on the continent, it was revealed that a former teacher at the Bishop Bell school had been jailed for child sex offences.
In 2009, supply teacher Robert Healy, then aged 27, was jailed for seven years at Lewes Crown Court after grooming two pupils on social networking site Bebo.
Megan left her home in Eastbourne last Thursday afternoon after telling her mother she was going to stay overnight at a friend's house. As the 15-year-old left her home she said to her mother: "Look me in the eye - I love you".
Later that day, Forrest's black Ford Fiesta was caught on CCTV travelling to the Port of Dover in Kent with Megan in the passenger seat.
They headed across the English Channel on a ferry and were due to return on Sunday evening but they did not use their tickets.
The last contact was on Friday when a message was sent to one of Megan's friends, saying that she had arrived in France, however the text did not come from her phone.
- Megan is white, 5ft 6in tall, slim, with long, straight, dark brown hair, blue eyes and was last seen wearing a white vest top and silver chain.
- Forrest is 6ft, slim with fuzzy facial hair and mousy brown hair. He wears square glasses, dresses casually and has a black star tattoo on his upper left arm.
Anyone with information is asked to call Sussex Police on 101, quoting Operation Oakwood. A dedicated telephone number and text number which can be used from abroad have been set up. They are 00 44 1273 475432 or text +447786 208090.