Traffic's flowing freely again after a three-vehicle crash at Tirau.

The incident occurred about 4.30 this afternoon, a few kilometres west of Tirau.

Witnesses described the collision of two cars and a truck as "massive", but police have confirmed there were only minor injuries.

A Northern fire communications spokesperson told Newstalk ZB one person was cut out of a vehicle but they didn't appear to be seriously injured.

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Fire, ambulance and police attended the crash and traffic earlier was down to one lane.