A person has been injured after the van they were driving crashed into a group of cows in the Waikato this morning.

Northern Fire Service shift manager Scott Ormond said firefighters from Mangatangi, Mercer and Tuakau needed to cut a person free from the wrecked vehicle after it struck two cattle on Mangatangi Rd - off State Highway 2 - near Maramarua.

Inspector Cornell Kluessien said conditions were foggy when the van ploughed into the roaming cattle.

The driver was moderately injured and was taken to Middlemore Hospital for treatment.

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There was nobody else travelling in the van when the accident happened.

One of the cattle was killed, said Mr Kluessien.