As part of the inquiries, police are asking anyone with information to contact 105, referencing file number 250821/2944.
Police especially want to hear from anyone in the area who has CCTV footage from around the time of the incident.
Alternatively, people can provide information anonymously to Crime Stoppers on 0800 555 111.
Police received reports of the assault around 6pm yesterday.
Hato Hone St John said they did not attend the incident.