The captain and co-pilot of the Canadair CL-215 plane were both killed when their aircraft crashed on the island of Evia, east of Athens, the air force said – the first fatalities in the current set of wildfires in Greece.

It gave the ages of the men as 34 and 27 respectively,

State broadcaster ERT earlier showed footage of the plane dropping water over a fire and then crashing into a hillside and bursting into flames.

Hundreds of firefighters, helped by forces from Turkey and Slovakia, were battling blazes that have raged on the island of Rhodes since Wednesday and resurged in hot, windy conditions.

More emergency flights were due to take foreign holiday-makers home.

Mitsotakis said on Tuesday the next days would be difficult, with conditions possibly improving after Thursday.

“All of us are standing guard,” he said.

“In the face of what the entire planet is facing, especially the Mediterranean which is a climate change hot-spot, there is no magical defence mechanism, if there was we would have implemented it.”

An assessment by scientists published on Tuesday said human-induced climate change had played an “absolutely overwhelming” role in the extreme heatwaves that have swept across North America, southern Europe and China this month.

In Greece, a prosecutor on Rhodes launched an investigation into the causes of the fires and the preparedness and response of authorities, state broadcaster ERT said.

It said about 10 per cent of the island’s land area had burned.

More than 19,000 people were evacuated from coastal villages and hotels earlier this week.

Lefteris Laoudikos, whose family owns a small hotel in the seaside resort town of Kiotari, one of the epicentres of the fire over the weekend, said its 200 guests – mainly from Germany, the United Kingdom and Poland – left in rental cars.

He said his father, cousin and two others were trying to douse the flames using a nearby water tank.

“On Saturday when I saw the wind and that there were no planes, I told everyone ‘we’re going to burn today,’” he said.

“My father saved the hotel. I called him, and he didn’t want to leave. He told me ‘if I leave there will be no hotel’.”

John Hatzis, who owns three unaffected hotels in northern Rhodes, said the island needed to welcome back tourists.

“After the superhuman efforts to contain the fire, we need superhuman efforts to restart tourism now,” he said.

Rhodes, one of Greece’s biggest islands, is among its top holiday destinations, attracting about 1.5 million foreign tourists in the summer months.

About 20,000 people had to leave homes and hotels in Rhodes over the weekend as the inferno spread and reached coastal resorts on the verdant island’s southeast after charring land, killing animals and damaging buildings.

After a blaze in the seaside town of Mati, east of Athens, in 2018 killed 104 people, Greece has taken a more proactive approach towards evacuation orders.

But critics say it has not improved its ability to put out fires that are common in summer, although more intense in this year’s heatwave.

The mayor of Rhodes said on Facebook the island was facing an unprecedented ordeal.

There were also fires on the island of Corfu.

Greece has registered very high temperatures in recent weeks and they are set to rise through Wednesday to exceed 44C in some areas.

About 3000 holiday-makers had returned home by plane by Tuesday and tour operators cancelled upcoming trips.

TUI dropped flights to Rhodes through Friday.

It said it had 39,000 customers on Rhodes as of Sunday evening.

Tourism accounts for 18 per cent of Greece’s economic output and one in five jobs.

On Rhodes and many other Greek islands, reliance on tourism is even greater.

-AAP