Men are less likely to talk than women with 54% of women having had a conversation compared to 37% of men.
Walthamstow Rape: Police Hunt 3 Men
The suspects left the area after the girl managed to call a friend who came to the scene and took her away.
Scotland Yard said the girl met the three men between 12.15am and 12.30am on Saturday, July 27.
Detective Inspector Simon Ellershaw, who is leading the investigation, said: "This was a very nasty attack on a vulnerable girl just 12 years old by a group of older males who engaged her in conversation before leading her to a secluded area.
"She was pinned down and two of the males then brutally raped her."
The first of the three men was described as dark-skinned and of mixed race, with a diamond stud in his left ear and a London accent. He told the girl his name was Mo and that he was 17.
He had large brown eyes, short hair, was very skinny and wore a black puffa-style jacket with a hood, black chinos, black trainers and a grey/black T-shirt.
The second was described as black and very tall with big lips. His hair was partly shaven and he wore black trousers with a red and blue shirt.
The third, who did not rape the girl, was black and had a moustache. He wore a blue hooded top and a red and blue cap, and told her his name was Miles.
The attack happened in an area at the end of Hibbert Road, near Theydon Street.
Anyone with information is asked to call police on 0208 217 7408 or Crimestoppers on 0800 555 111.
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