The man accused of the assault was wearing a light brown jacket, dark trousers and a dark beanie hat.
Mr Speight, who is 6ft, was wearing a brown suit jacket with dark jeans and a brown flat cap.
He was wearing a brown hooded jacket, blue jeans and white sneakers at the time of his escape, police said.
They are both described as white, one being 6ft, well built and wearing a brown leather jacket at the time.
The security camera footage shows Sierra eating alone in the food court of a shopping mall near the hostel where she was staying and walking around the mall, dressed in jeans, a brown leather jacket and a winter hat, her hands in her pockets.
Mr Brown, who wearing an open neck shirt, brown jumper, jacket and dark trousers, said the couple were "delighted" that Sarah was returning home.
The second was believed to be 6ft 3in, thin, with short brown hair with a left side parting and wearing a brown bomber style leather jacket, hooded sweatshirt and light blue jeans.
Although he ambles around Whitechapel in his brown hat and green jacket with a six-shooter strapped to his waist, it was the mustache (he would never grow one for himself), and Warlow's larger-than-life concept of Jackson, that made things come alive for Rothenberg.
He is described as 5ft 8ins (1.7m) tall with dark brown hair and was last seen wearing a black jacket, white polo shirt, skinny blue jeans and black trainers with white soles.
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As the Suwanee Quintet sang gospel tunes, Brown -- decked out in a black leather jacket with stars and stripes down the sleeves -- grabbed the microphone and added his signature screech to applause from the crowd.
The other man has brown, spiky hair and was wearing a tracksuit which may have been grey, with a body warmer or jacket.
She was wearing a black, zip-up jacket over a blue, long-sleeved, round-necked T shirt, black denims and brown knee-high boots with flat soles.
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