Detectives from Met Police are appealing for witnesses following an attempted rape in Islington.
Officers were called to Gillespie Park just before 7pm on Tuesday following reports of an attempted rape.
A woman was walking through the park when she was approached by an unknown man hovering near some bushes, who then attempted to rape her, police said.
The woman fled the scene and told officers that a separate unknown man chased the attacker. Police believe this man may be a potential witness and want to speak to him as part of their investigation.
The suspect wore dark clothing and is described as Black and around five foot eight in height.
The victim is currently being supported by specialist officers.
An investigation has been launched and officers are keen to speak to the man who chased after the suspect, or any other witnesses.
Detective Chief Inspector Paul Ridley said: “This was an attack targeting a lone female in an open park space. We'd like to reassure the public that we are working at pace to try and find this suspect.
"We'd really like to speak to the man who chased after the suspect, as he may have some crucial details to help us identify him.
"The location is used to access nearby Finsbury Park and Arsenal Underground Station and therefore frequented by commuters who may have seen or heard the attack or who may have also noticed the suspect in the area prior to the incident.
"Or if you have noticed any concerning behaviour in the area recently please let us know. Even the smallest bit of information could make a real difference in our investigation."
A crime scene is currently in place in the park as enquiries continue.
