A police car had to be towed after driving over "nails" left along a busy stretch of state highway through Napier.
The incident happened about 7.30am on Sunday morning, along the Hawke's Bay Expressway, near the roundabout to Hawke's Bay Airport.
"The tyres of a patrol vehicle were damaged this morning in Napier. Enquiries are ongoing to determine the circumstances. No arrests have been made," a police spokesman said.

He said it appeared to have been nails which caused the damage. Rhere were no immediate reports of other cars being damaged.