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"It is now more than three weeks since Marie was last seen and we are extremely concerned for her welfare as are Marie’s family."
Marie is Chinese, 5ft 4ins tall, of a slim build with bob styled dark hair.
Although it was not confirmed, her family say she may have been wearing a long grey woollen coat and black trainers. She may also have been wearing glasses.
Sergeant Charandeep Billkhu, from the force’s Missing Persons Operations Team (MPOT), said: “It is now more than three weeks since Marie was last seen and we are extremely concerned for her welfare as are Marie’s family.
“We are continuing to carry out enquiries to help find Marie and are continuing to appeal to you the public as part of this.
“A new image of Marie has been shared by her family. Please look closely at it. Do you recognise Marie? Have you seen her? Do you have any information which you think could help us?
“If you think you have any information which could help us find Marie, then please get in touch. You should contact 101 quoting incident 636 of 13 March.”
Marie Wan