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Police are calling for the public to be on the lookout for "miscreants and losers" following recent car vandalism.
Sergeant Tony Woodbridge said windows were smashed and keyholes damaged in two cars, a Suzuki wagon and a camper van, on Tuesday or Wednesday.
The cars had been parked at Awamoa Park in the town’s "unofficial car sale yard".
"We’d ask the public to be on the look out for miscreants and losers hanging around up there," Sgt Woodbridge said.
"It’s inherently dangerous, and as everyone in Oamaru knows, we regularly get reports of cars being broken into there, or damaged."
Police and the Oamaru Community Patrol continued to monitor the area.