The Independent Police Conduct Authority oversaw a police investigation into the incident.
"We can grow them from egg to three-and-a-half kilos in a year."
A company van was broken into, then set alight outside the Kawakawa Medical Centre.
The crash happened in in Matarau, Whangarei.
The students are being cooperative with police, said a spokesperson.
"We can't wait for another flood to go through this, businesses are on the line."
Five men have been arrested in Northland after a police investigation into allegations of a sexual nature involving a minor.
A Northland swamp farmer has lost hectares of grass to flooding just months after a drought dried up pastures.
"Coming out of the worst drought in 40 or 50 years there's not a lot of spare feed around."