The girl was in Walthamstow between 12.15am and 12.30am on Saturday when she met three men, police said.
She was taken to a garage area at the end of Hibbert Road, near Theydon Street, where she was pinned down and raped by two of the men.
The girl managed to call a friend who came to the scene and they left together. The suspects then left the area.
More top news
The body of a 15-year-old boy has been recovered from the River Thames after he was spotting in difficulties in the water.
A woman and a boy have been killed after a car police were pursuing crashed into a family.
A 23-year-old man has died after being injured in an altercation inside a minicab.