CCTV images show Ms Bracht in Newcastle and then in London
A woman missing from her Wearside home for almost two weeks, "radically changed" her appearance to evade being identified, according to detectives.
Natalie Bracht, 34, left her home in Sunderland on 17 May with her daughters, aged between five and 13.
She travelled to Newcastle and then by train to London's King's Cross.
CCTV images show her in Newcastle wearing a red Berghaus-style jacket, but in London she is seen wearing a flowing white robe and head scarf.
Officers from Northumbria Police have concerns regarding her emotional well-being and are being assisted by their counterparts in the Metropolitan Police force.
Ms Bracht is described as 5ft 6in tall, of medium build, with shoulder length dark hair, which is sometimes tied back.
She moved to the North East in 2006 with her children from Germany and speaks good English, with a heavy German accent.
Det Ch Insp Roger Ford on the search for Natalie Bracht and her children
The first CCTV still shows Ms Bracht in Newcastle at 1438 BST on 17 May, wearing a distinctive red Berghaus-style three-quarter length jacket, with dark coloured hood and shoulders, and blue jeans or trousers. She is seen carrying a rucksack.
The second CCTV still was taken on the same day at 1820 BST, at King's Cross Station in London, where she is seen wearing a flowing white robe and head scarf.
DCI Roger Ford said: "These CCTV images of Natalie show that somewhere between Newcastle and London she deliberately and radically changed her appearance.
"It shows a high degree of planning and a great deal of effort to evade being identified which further raises my concerns about her emotional well-being and the safety of her children.
"They have been away from their home, their friends and their school for more than a week, and that is clearly not in their best interests.
"I cannot rule out that someone or some organisation is offering the family assistance or shelter, possibly for what they believe to be all the right reasons."
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