The collapse on Friday night at a Six60 concert injured 18 people, two of whom remain in hospital.
Inspector Jason Guthrie, of Dunedin, said police officers and Campus Watch staff moved about 100 people from dangerous positions on roofs as the crowd swelled to 1500.
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‘‘However, despite almost constant effort and appeals to people on balconies, police and Campus Watch were unable to persuade these individuals to voluntarily move.''
Officers were ‘‘declined entry into a number of these dwellings'', Insp Guthrie said.
Police did not ‘‘endorse'' the concert and were not involved in the planning. Extra officers were sent to the area once the concert started. Police said yesterday there would be no criminal investigation.
Worksafe New Zealand will also not be investigating as the incident did not happen at a workplace.
‘‘WorkSafe understands the need to get to the bottom of what occurred to help ensure people are kept safe. The Ministry of Business, Innovation and Employment will complete a report looking at whether the balcony was up to the standards required by law under the Building Code,'' a spokeswoman said.
The decision by Worksafe NZ and police follows the viewing of a 3-D video of the collapse.
The Otago Daily Times viewed the Animation Research footage of the collapse yesterday, which showed about 15 people on the balcony and no-one jumping, despite reports people had been.
Animation Research chief executive Ian Taylor said people were on the balcony for about three hours before, meaning people could well have been jumping before the recording started.
Mr Taylor said he would not release the footage publicly but police, government officials and Six60 band members had seen it.
‘‘It's an unprecedented view of an incident. If we released this, it would absolutely go viral [but] there's a reason we're not letting this out.''
Mr Taylor said there were lessons to be learned from the footage and from the incident. Dunedin female rapper Arcee, an opening act at the Castle St show, said people had crammed the balcony for the sound-check about four hours before the accident.
‘‘The one that collapsed was shaking. That was at the sound-check at 3.30pm.''
Arcee ‘‘most definitely'' believed people were jumping up and down on it at one point.
‘‘Everyone was just getting into the music.''
Arcee's back-up singer, Greta Bull-Crossan, said she made an announcement during their performance asking people to get off the roofs but not the balconies.
‘‘I wish I had gone and told them [people on the balcony].
‘‘It never really came across my mind to make sure that the proper authorities be told. Your mind is not really on structural things, which is why I ran over and helped with first aid. I helped St John put the spinal board on the girl and put a splint on a leg.''
Otago Polytechnic Students' Association president Kayla Miller confirmed two of those injured were polytechnic students.
Miss Miller said the polytechnic would support the injured students and their families.
Otago Polytechnic's Dunedin School of Art head Prof Leoni Schmidt said in a statement on the school's Facebook page that it was ‘‘very sad to hear about George Karamaena's accident''.
He was in Dunedin Hospital and would undergo surgery, Prof Schmidt said.
‘‘His lecturers are making a plan so that he can continue his studies off site for the time being.''
Mr Karamaena was a member of an Invercargill softball club.
A supplier of non-alcoholic drinks to the gig, Charlie's, said in a statement yesterday it was a ‘‘horrific'' incident.
The company had been approached by Six60 to supply non-alcoholic drinks, it said.
‘‘[Charlie's] thoughts are with the young people who were injured as well as their families.''
Dunedin Mayor Dave Cull told Radio New Zealand city authorities might need ‘‘new tools'' to deal with large gatherings like the Six60 gig.
‘‘It could be about shutting things down or preventing things, or having some kind of protocol.''
Mr Cull did not respond to attempts by the ODT to contact him yesterday.
