Investigations are ongoing into the cause of two large, suspicious Hastings fires in the past week.

There have been a spate of serious fires in Hawke's Bay recently, with the two worst resulting in the death of a young child, and another leaving a woman with life threatening injuries.

Police are investigating both fires, which occurred within days of each other, but have been staying mum about new details.

Yesterday a police spokeswoman said enquiries were ongoing for both investigations.

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On Monday afternoon St Leonards was covered in smoke from a large fire which started at an unused commercial property on Heretaunga St West.

Fire and Emergency went to "third alarm" and had six appliances with 30 crew members.

Ariki River Baden Mau, 10, was rushed to Hawke's Bay Hospital with life-threatening injuries, but died in the early hours of Tuesday.

His service will be held at Kahuranaki Marae, Te Hauke, this morning.

Another boy involved, aged 9, is in a stable condition at Hawke's Bay Hospital, after being transferred back from Hutt Hospital, where he was taken on Wednesday in a serious condition.

Five adults were also taken to hospital for smoke inhalation but were discharged.

Police are treating the fire as suspicious. With fire investigators they had completed the examination of the derelict building on Heretaunga St West, but were yet to speak to those involved.

Investigations are also continuing into a house fire in Mahora on Sunday morning, where a 30-year-old woman was pulled from the house, on Kauri Pl, with life threatening injuries.

She remains in a critical condition in the intensive care unit at Hawke's Bay Hospital.

The cause of the fire was not yet known, but was thought to have started sometime between 3.30am and 6am Sunday.

The fire started in a bedroom and was able to be confined to that room, however other parts of the house were smoke and fire damaged.