Police are searching for a man who is believed to have been in a kayak without a paddle.

Police were alerted to a man yelling for help while floating down the Waikato River on a blue and white kayak around 5pm.

Waikato Police launched a boat to find the man. They found the kayak on the water and the paddle but the man is yet to be found.

He was wearing a black T-shirt, black shorts and is thought to be in his 20s. He was not believed to be wearing a lifejacket at the time.

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Contact the police on (07) 858 6200 if you are the man, know where he is or have seen him.