Investigations are ongoing following an incident in Dukinfield.
On the evening of Thursday, January 24, a woman was walking her dogs down Oxford Road when an unknown man approached her from behind.
When she turned around, he had unzipped his coat to reveal his genitalia exposed underneath before fleeing in an unknown direction.
The male was described as white, aged 16-18 and of slim build. He was wearing a grey top, black tracksuit bottoms and black trainers.
Members of the public are asked to be vigilant when walking alone at night and report any suspicious activity by dialling 101.