Thieves have targeted veterinary supplies in an early morning ram raid in Wairarapa today.

At 3.25am, police were called out to a vet supply warehouse in High St, Carterton, following reports of a break-in.

A police spokesperson said one of two vehicles involved in the ram raid had been stolen earlier in the weekend.

"At this stage it's still being established what was taken."

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Two hours later, Wairarapa police were involved in a separate pursuit through Masterton after police attempted to pull a vehicle over at a routine traffic stop, Fairfax reported.

The vehicle fled, leading to a short pursuit that ended when the car drove into the Waipoua River bank.

The occupants fled the scene and were still being sought.