A woman was taken to hospital after an incident at Eden Park after Saturday night's P!nk concert.
Auckland woman Rachel MacGregor said she was assaulted by security, but police said the woman became abusive after being asked to move on.
MacGregor said she had a bad migraine at the concert and was disoriented and overwhelmed.
With the concert over and things being packed away, MacGregor said she decided to take a photo of the stage but was then approached by several security guards telling to leave.
She said the situation quickly escalated.
"There were four ... men holding me on the ground, she said.
She said she ended up in hospital with bruises and a head injury.
Hato Hone St John Event Health Services, who were onsite during the concert, confirmed a woman was transported to Auckland City Hospital in "a minor/moderate condition".
Eden Park said the safety of people at their events, including patrons, staff, and contractors, was their utmost priority.
"We are aware an incident occurred after the concert had finished, fans had left, and the venue was being packed down," a spokesperson for Eden Park said.
"The relevant authorities, including the NZ Police, were asked to assist our contractors, and investigations are continuing."
A police spokesperson said they were asked to assist after "a woman who'd been asked to leave the venue became abusive toward venue security".
Police said they provided advice to the woman and took her details in case any follow-up was required, as is usual practice.
"No further action was taken."