Police are seeking help to identify a man who allegedly indecently assaulted two school children on a bus.

The man was on the 966 Birkenhead bus travelling from Ponsonby to Auckland's North Shore on July 31, at approximately 3.30pm, when he allegedly assaulted children aged 11 and 12.

Detective Ryan Bunting said despite extensive inquiries made to date, the suspect has not yet been identified.

"Police are keen to hear from anyone with further information," he said.

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Bunting described the suspect as an Asian male, aged 45-50-years-old, of medium build and with short, straight black hair.

He was said to be wearing a dark coloured pin striped suit, a light blue business shirt, black dress shoes and wire framed glasses.

Anyone who knows this man or has any information on the assault is asked to call the North Shore Crime car on 09 477 5261 or Crimestoppers anonymously on 0800 555 111.