German police are questioning a man who is believed to have been part of a group filmed attacking a woman in a Berlin subway station.
The unprovoked attack, which occurred in October, sparked outrage after the authorities released CCTV images on Thursday showing the woman falling down stairs after being kicked in the back. A number of campaigns have sprung up offering a reward for information about the men involved.
The man who is assisting police is said to be from eastern Europe, and is not thought to have been the attacker himself.
Police have denied reports that the 26-year-old woman was targetted because she was wearing a veil. In fact she simply had her hood up. She suffered a broken arm.