£10,000 reward is offered as police release CCTV of a man they want to trace over an Islington attempted rape

The woman, in her early 20s, was approached near Essex Road at 3.20am on July 4 and dragged into a Church Road doorway. Two passers-by heard her screams and stepped in, and one restrained the attacker before he fled towards Angel. Detectives have yet to trace that second rescuer. DCI Paul Ridley said the attack had a 'devastating impact' on her daily life.

The man police want wore a blue-and-pink tie-dye T-shirt and has a distinctive left-arm tattoo.

He is said to be 5ft 8ins to 6ft, of average build, with short or shaved hair.

DCI Ridley urged callers: 'Even if you are not completely certain, please make that call.'