Police have released CCTV footage of a man they would like to speak to after a teenager was sexually assaulted on a bus.

The 17-year-old girl was on board a 251 bus travelling towards Edgware where she was inappropriately touched by a fellow passenger.

He then followed her as she alighted at Mill Hill Broadway Station and began singing to her in what she believes to be Arabic.

The suspect is described as an Arabian male, aged 30 to 35-years-old, with dark, short hair, wearing a black jacket and jeans.

The incident happened on Wednesday, January 15 at 6pm.

Anyone with information is asked to call the police on 101.