Police are seeking witnesses to a fatal crash in southeast Auckland on Wednesday.

A crash between a car and motorcycle occurred at around 5.45am on Stancombe Rd in Flat Bush.

The crash involved a single motorcyclist riding a late-model silver Yamaha motorbike which crashed about 400 metres east of Chapel Rd.

Police would like to speak to anyone who may have seen this motorcycle being driven that morning leading up to the crash.

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If you have any information which may assist police inquiries, please contact Constable William O'Connell, Counties Manukau Police on 09 263 2761 or Crimestoppers anonymously on 0800 555 111.