Police said they wanted to hear from anyone who witnessed the assault or knows who may be involved.
“In particular, we want to speak to two women who were sitting close by when the incident occurred, and who would have witnessed what happened.”
Anyone with information that could assist inquiries can contact police online or call 105.
People should use the reference number 241006/5414. Information can also be provided anonymously via Crime Stoppers on 0800555 111.
Police have also opened an online portal where anyone with any relevant video footage or images can upload material.
Georgina Campbell is a Wellington-based reporter who has a particular interest in local government, transport, and seismic issues. She joined the Herald in 2019 after working as a broadcast journalist.