LAHAINA, Hawaii (AP) — As Hawaii residents mourned those killed in ferocious wildfires, officials warned that the full human and environmental toll was not yet known and the recovery only just beginning from the destruction wrought by flames that galloped a mile every minute.

Twenty dogs and dozens of people will make their way through neighbourhoods reduced to ash, searching burnt out cars and homes for the dead. With the toll at 96, this is already the deadliest US wildfire in more than a century. Two fires have not yet been completely contained, including the one that demolished the historic town of Lahaina, according to an update from Maui County late Sunday.

Even where the fire has retreated, authorities have warned that toxic byproducts may remain, including in drinking water, after the flames spewed poisonous fumes. And many people simply have no home to return to — so authorities plan to house them in hotels and vacation rentals.

The blaze that swept into centuries-old Lahaina on Tuesday destroyed nearly every building in the town of 13,000, leaving a grid of gray rubble wedged between the blue ocean and lush green slopes. That fire has been 85 per cent contained, according to the county, while the Upcountry fire has been 60 per cent contained.

“There’s very little left there,” Governor Josh Green said, holding up a map of the area titled “Buildings Damaged in Maui Wildfires Lahaina Area.” He added that “an estimated value of $5.6 billion has gone away.”

Crews with cadaver dogs had covered just three per cent of the search area, Maui Police Chief John Pelletier said Saturday.

When teams “do come across scenes in houses or businesses, it is very difficult for them because they know, ultimately, they will be sharing with our people that there have been more fatalities. I do expect the numbers to rise,” Green said.

The cause of the wildfires is under investigation, and Green said authorities would also examine their response. One fire, for instance, was thought to be out but later flared again. Before a fire engulfed Lahaina, Maui County officials also failed to activate sirens that would have warned the entire population and instead relied on social media posts.

Fueled by a dry summer and strong winds from a passing hurricane, the flames on Maui raced through parched brush — one moving as fast as 1 mile (1.6 kilometres) every minute, according to Green.

“With those kinds of winds and 1,000-degree temperatures, ultimately all the pictures that you will see will be easy to understand,” he said.

The fires are Hawaii’s deadliest natural disaster in decades, surpassing a 1960 tsunami that killed 61 people. They also surpassed the 2018 Camp Fire in northern California that left 85 dead and destroyed the town of Paradise.