The police say that they have strong indications that she is still alive and are appealing to the general public to help find her.
The Brussels Public Prosecutor has asked the centre for missing and abused children Child Focus to distribute the photograph above this article to help in the search for Sonia. Meanwhile, the Federal police are appealing for witnesses to the disappearance.
Sonia Kriegels is about 1.63 m tall and of normal build. She has long black hair, brown eyes and wears glasses. When she disappeared she was wearing bright blue stretch trousers and a marine blue hooded sweater. She was also wearing black All Star basketball shoes.
Anyone with information about Sonia Kegels whereabouts is ask to call the police on the Freephone number 0800/30300. You can also email the investigation team at the following address: firstname.lastname@example.org.