An old projectile from a World War Two era artillery has been successfully detonated by the defence force in Paraparaumu.
Police were contacted this morning by a family who had found the historic projectile in Belmont Regional Park during the school holidays.
The kids took it home to their grandparents house, and after googling the item they thought it was safe to keep and clean up to take to school for show and tell, the police said in a statement.
Last night the children returned to their home in Paraparaumu with the artillery round in the car.
Another grandparent was concerned about safety and moved the item into the backyard before calling Police this morning.
Police arrived at the house and put a cordon in place, evacuating three nearby houses as a precaution.
The New Zealand Defence Force Bomb Disposal Unit then inspected the projectile, confirming it was potentially still live, deciding it should be detonated in a controlled explosion.
It was then transported to a safe location at Higgins Quarry in Paraparaumu where it was buried and detonated by remote.
A large sinkhole that has opened up in Taupō after a water main broke could take weeks to fix.
Two teenage boys raised the alarm about 5.30pm yesterday after they noticed a water leak on Arrowsmith Avenue - between Chesham Avenue and Weka Road.
Emergency services were called and found water pouring down the gully and a significant part of the road washed out.
Up to 12 engineers and council staff are on site today to assess the damage left by the hole, which the council said was 10 metres by 8 metres and up to 8 metres deep.
"We've had damage to the water main, the council water storm water, and down through the gully we've had considerable amount of pumice that has washed down through," Taupō District Council water asset manager Tom Swindells said.
A couple of houses had had pumice wash through their sections and one of the properties had some go through their garage and lower floor area, he said.
The cleanup and repair costs would be significant, he said.
The asbestos cement pipe that burst was likely old and probably needed replacing, he said.
"Within our district we do have a considerable number of asbestos water mains in the ground."
While the council plans to replace those, it could not be done overnight, he said.
The teenagers who raised the alarm acting quickly by calling emergency services and alerting neighbours, he said.
"It was an exciting but scary moment for them but they did all right things."
About 20 properties had their water supply disrupted last night but that was reinstated to all but two properties within three hours.
Repairs could take weeks and he urged the public to avoid the area.