Concerns about how many investigations will be held into Mount Maunganui's deadly landslide, with six people still buried and careful recovery work continuing.

WorkSafe will look into organisations with a duty of care at the holiday park, the Council's reviewing events beforehand, and Fire and Emergency could launch a probe.

The Institute of Safety Management's Mike Cosman says police will investigate on behalf of the Coroner, and could do so in their own right too.

He says others may also be looking deeper.

"One of my concerns here is that when you've got multiple simultaneous investigations going on - is witnesses, whanau, first responders having to retell their stories multiple times to multiple different agencies. It can be incredibly traumatic."

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