A teenage girl who vanished in Germany nearly a month ago has been found in France with 'no memory of who she is'.

The 16-year-old, known only as Isabella O, was discovered wandering the streets of France nearly 500 miles away.

She had not been since since March 22 in her hometown of Celle.

German police found her suffering with a memory black out, reports suggest, but she was unharmed and is currently undergoing medical examinations.

She is receiving treatment to try and establish the cause of her memory loss, it has been claimed.

Isabella O had online classes in the morning and it was not until the afternoon that her younger brother noticed she was not home.

Known only as Isabella O, she was found walking the streets in France
Known only as Isabella O, she was found walking the streets in France

According to her parents' statements, who were at work at that time, it was unusual that Isabella had left the house without taking her keys, wallet or phone with her.

They finally decided to call the police after high school student did not return home after several hours.

The police search lasted for two weeks and included sniffer dogs that tracked a route Isabella possibly took the morning she disappeared. However, the tracks were lost in a nearby shopping centre.

Police sniffer dogs detected her route
Police sniffer dogs detected her route

The dad of the teenage girl, who has not yet been reunited with her, said she suddenly woke up in France without knowing how she had got there and asked for help from local residents.

As she did not have any recollection of who she was, she had to be placed in a foster home.

The girl is not allowed to see her family until her condition improves.

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Police spokesperson Brigit Insinger said that the missing person case is closed for now.

But they currently have 'no idea' how she ended up in France.

Insinger added: "It might sound strange, but that's all for now. If Isabella remembers something and tells us that somebody did something to her of course we would reopen the case."