Four eight-year-olds playing with fireworks caused a sprinkler to go off at a Napier business last night.
Emergency services were called to Dollar King on Dickens St, Napier, after an alarm activation at about 9.50pm.
A police spokesperson said police were called by fire crews because the incident was believed to be suspicious.
Four eight-year-olds were found at the scene and police had spoken to their parents, she said.
The alarm activation appeared as though it had been started by the youths after they threw a firework into the property.
Napier Volunteer Fire Brigade senior station officer Jamie Nichol said the firework had been thrown through a gap in a roller security door.
The firework did not damage the property but it caused the sprinkler system to activate and saturate many items in the store, he said.
"They were being reckless with fireworks and set off a sprinkler."
Two appliances from Napier and an incident support vehicle attended to help salvage items in store, he said.