Police have released a sketch of a man suspected of attacking a 19-year old woman at Jellie Park in the Christchurch suburb of Burnside on Sunday.
A spokesperson says the composite image has been based on information provided by the victim who was interviewed by police again on Tuesday.
The attacker is described as being Pakeha, with dark facial hair.
Police would like to hear from anyone who may have seen suspicious activity in the vicinity of Jellie Park between 1.30am and 2am on Sunday.
They say inquiries with medical facilities have so far not provided any leads on the suspect, believed to have been bitten by the woman's dog.