Police have arrested a youth in relation to a fire that sent plumes of black smoke into the sky above Invercargill last week.
Witnesses said the source of the fire, near Turnbull Thomson Park, was a stack of rolled hockey turf.
Fire and Emergency New Zealand shift manager Simon Lyford said two appliances attended initially.
"On arrival, they found a well-involved fire which was threatening some neighbouring structures so they triggered a second alarm," he said.
Police today said a youth had been arrested and was due to appear in the Invercargill Youth Court.
An investigation is ongoing.