A plane fighting wildfires in Greece has crashed as Greek Prime Minister Kyriakos Mitsotakis warned of tough days ahead with blazes destroying homes and forcing the evacuation of thousands of tourists from the island of Rhodes.

The fire brigade did not give further details of the crash.

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

It said the accident happened over the town of Karystos on the island of Evia, east of Athens.

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 home holidaymakers.

Mr 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 hotspot, 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 has 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.

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, Britain and Poland – evacuated 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 summer 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 south-east, after charring land, killing animals and damaging buildings.

There were also fires on the island of Corfu.

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

More than 2000 holidaymakers had returned home by plane on Monday 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.

-Reuters