Volunteers and firefighters were working relentlessly Tuesday, often without masks or helmets, in a desperate bid to stop a violent blaze from reaching a key town on Greece's Evia island, one of hundreds of fires that have raged through the country.

Nearly 900 firefighters, reinforced with fresh arrivals from abroad, were deployed on the country's second largest island as major towns and resorts remained under threat on from a blaze burning for eight days.

An islander holds an empty water hose during an attempt to extinguish forest fires approaching the Evia island village of Pefki
An islander holds an empty water hose during an attempt to extinguish forest fires approaching the Evia island village of Pefki AFP / ANGELOS TZORTZINIS

Prime Minister Kyriakos Mitsotakis announced a package of 500 million euros ($586 million) in emergency help to those affected by what he has dubbed a "natural fury without precedent", as well as for reconstruction of devastated areas.

Weather disasters bulked up by climate change have swept the globe this summer, with a landmark UN assessment published Monday warning the world is warming even faster than forecast.

Hundreds of homes have been lost on the Greek island of Evia
Hundreds of homes have been lost on the Greek island of Evia AFP / ANGELOS TZORTZINIS

Hundreds of homes have been lost in Evia, greater Athens, the Peloponnese and other parts of Greece to wildfires since late July, as the region suffers through an intense heatwave.

Underscoring the violent swings of fortune tormenting Greece, fires in the Peloponnese flared anew just an hour after officials said the situation was stabilising.

Residents in 20 small villages in the region of Gortynia were warned to evacuate on Tuesday, with the mayor saying conditions seemed out of control again.

Wildfires on Greek island
Wildfires on Greek island AFP / Gal ROMA

"In the blink of an eye, all control was lost," mayor Efstathios Soulis told state TV ERT, adding that dozens of villages, agricultural units and businesses were at risk.

The flames have claimed three lives in Greece, while in neighbouring Turkey eight have been killed eight. Several people have been injured, some critically.

Two Serbian firefighters use a hose to extinguish a smouldering forest fire in the village of Glatsona on Evia island.
Two Serbian firefighters use a hose to extinguish a smouldering forest fire in the village of Glatsona on Evia island. AFP / ANGELOS TZORTZINIS

Sixteen people have been arrested on suspicion of arson or negligent arson, the police said.

Fire burns as firefighters struggle to contain Greek fires
Fire burns as firefighters struggle to contain Greek fires AFPTV / Savvas KARMANIOLAS

Much of the attention was focused Tuesday on keeping the fire out of Evia's northern hub of Istiaia, which has 7,000 residents who had yet to evacuate.

Firefighters and volunteers had been engaged overnight in "hand-to-hand combat, fighting heart and soul" to erect fire breaks outside villages neighbouring Istiaia, mayor Yiannis Kontzias said.

The fire on Evia pictured from above
The fire on Evia pictured from above Planet Labs / Handout

Locals, often in just t-shirts, battled the flames on several fronts, one of which raged out of control.

The Evia force includes hundreds of firefighters from Romania, Serbia and Ukraine. They were reinforced on Tuesday with units from Cyprus, Slovakia and Poland, the civil protection authority said.

Map of Greece showing the major fires on the island of Evia.
Map of Greece showing the major fires on the island of Evia. AFP / Thorsten EBERDING

The rugged island is popular with holidaymakers and many Greeks have summer homes on Evia. Some 3,000 people were evacuated by sea this past week as the flames neared.

Authorities ordered the evacuation of Asiminio, a coastal village near Istiaia also threatened by flames, on Tuesday.

"Where do you want us to go?," a woman in her sixties shouted, refusing to leave as helicopters flew ahead.

On the streets, dozens of residents pointed angrily at a Slovakian firefighting truck. "Look, they're doing all the work. Where are ours? We beg them to come and no one comes," said Dimitri.

In Avgaria village, many people turned out to help the professionals.

"If we don't come, who will?" asked Yiannis, a burly man in his 20s. "My aunt's house burnt down, that of my grandfather almost did too."

The fire has also wrought havoc on the island's agricultural economy that included olives, figs and honey, leaving many producers despondent.

Istiaia Mayor Kontzias said "mistakes were made and we need to draw lessons from this".

"The Greek state must never forget what happened in northern Evia," he added. "Helicopters helped a lot and if we had done that since the beginning, we would have avoided all this destruction."

He was echoing a complaint widely heard about the lack of air support not just on Evia but throughout Greece.

Many mayors around the country have complained of a serious lack of aerial support in fighting the fires, despite government assurances of having set aside ample resources.

"Every lost home is a tragedy, a dagger to the heart," Deputy Civil Protection Minister Nikos Hardalias said Tuesday, his voice breaking.

In a televised address on Monday, Mitsotakis apologised "for any shortcomings" in the state response.

"We may have done what was humanly possible, but in many cases it was not enough."