A 13-year-old girl who is missing from home is thought to be staying with someone she contacted on an internet chat room site.
Hannah Cooper disappeared from her home in Tillingham near Southminster, Essex, on 11 March.
It is thought Hannah travelled to Stansted Airport to meet a person she had been chatting to online.
Police are appealing to hoteliers in the London and Essex area to contact them if they have seen the youngster.
Police initially thought Hannah may have travelled to Nottingham to meet a teenager she met online.
But having contacted the teenager in Nottingham, police have since established that any plans Hannah had to travel north changed.
CCTV footage
She went out on her bike on Sunday morning after telling her parents she was going to visit a friend.
The bike was found in the evening at Southminster rail station.
A police spokeswoman said CCTV footage showed that Hannah got on a train to Wickford in Essex and then travelled to London Liverpool Street, arriving at about 1330 GMT.
It is now believed she took a further train to Stansted Airport where she met someone off a plane.
"Hannah had no travel documents on her so there is a strong possibility she is now in the company of someone else," a police spokesman said.
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