Mr Nightingale said shutting down free internet was another tool police could look at. He didn't want to disclose the businesses police would be talking to.
"It's a very much watch this space at this time ... We can't tell them how to run their businesses." Chamber of Commerce chief executive Darrin Walsh said he liked the police's suggestion.
"I think it is a great idea. Some of them do have free Wi-Fi and if they shut them down at night it should have an impact."
He said businesses also needed to look at security lighting.
"They are looking for dark places where they can get up to their mischief."
He said there were some "good common sense" actions businesses could take, including clearing away shrubbery and making sure there was a clear line of sight around the business.
"Where you create opportunity unfortunately some of our youth will take that."
Bully Free Bro co-ordinator Darcy Hunt, who works with youth through Te Waiariki Purea Trust, said young people liked to congregate in groups and not all were committing crime.
"Hanging out in groups is part of our culture in New Zealand. Our parents did it, their parents did it ... There's just a small amount of people who are spoiling it for the others in the group who are minding their own businesses and doing the norm."
He said for parents it was about setting boundaries and making sure children were kept occupied.
How to keep businesses safe:
* Turn off free Wi-Fi after hours
* Install security lighting
* Cut back shrubbery and anything blocking a clear view
