Humberside Police are investigating the alleged assault of a woman, which happened on 1 August at around 5.45pm.
A man in his 50s is alleged to have grabbed a woman in her 40s as she rode her bicycle home.
A passer-by stopped and helped break up the incident but did not leave his details. The police would like to speak to this man to ask him to provide a statement about what he saw.
If this was you or you know who it is please call the police on the non-emergency number 101 quoting log 475 of 1/08/17.