A scene examination will be carried out over the following days, police said.
An apparent pool of blood was visible just outside the tennis courts next to a disposable vape. A police photographer, wearing a boiler suit, was focused on this area.
Armed police arrived at the scene just before 3pm.
At least four police dog units arrived by 1pm and there were “heaps” of officers. More officers arrived when the Herald was at the scene, including a forensic photographer.
“More information will be issued proactively when [police are] in a position to do so,” she said.
A man working near the Blockhouse Bay Tennis Club told the Herald police had come to his work to investigate an alleged assault.
Officers told him they were “looking for someone”, he said.
This afternoon, police said the investigation is “in its early stages” but members of the public “can expect to see an increased police presence in the Blockhouse Bay area while these enquiries continue”.
“We will be speaking to those who witnessed what has occurred and we encourage anyone with information who has not yet come forward to contact police as soon as possible,” a police spokesperson said.
Information can be provided through 105 or online at https://www.police.govt.nz/use-105 , using “Update My Report” and reference file number 240824/4136. Alternatively, information can be provided anonymously via Crime Stoppers on 0800 555 111.