Thousands of residents are being evacuated from their homes as a large wildfire continues to rage north of Athens, with flames leaping as high as 25m (80ft).

The historic site of Marathon is among the areas where residents are being moved to safety by the emergency services.

Houses and properties in the nearby town of Varnavas were burning, according to the fire brigade. Firefighters were also evacuating people trapped by flames in a convoy of 20 to 25 vehicles that had been trying to escape the area.

Forty fires have broken out in Greece since Saturday afternoon with firefighters still battling seven.

Climate crisis and civil protection minister Vassilis Kikilias warned that extremely dangerous weather would continue. Greece has just experienced its hottest June and July on record.

Greek PM Kyriakos Mitsotakis returned to Athens on Sunday, cutting his holiday short, to deal with the crisis.

In Varnavas, the wildfire that started on Sunday afternoon had burned 100 sq km (38 sq miles) of land by 19:00 BST.

Varnavas and Grammatiko residents were instructed to evacuate in a message from the national emergency number.

Residents of historic town Marathon were told to evacuate towards the beach town of Nea Makri.

Fire Brigade spokesperson Vassilis Vathrakogiannis said the fire was quickly fanned to a huge size by winds of up to 8 Beaufort (39-46mph).

“We are appealing to all residents of the area. For their own safety and given that the fire is advancing rapidly, it is imperative that they heed the instructions of the authorities,” Mr Vathrakogiannis said.

“At this time, the fire is advancing toward Marathon Lake with the forces against it being constantly reinforced, focusing on the flanks and dealing with flames that in some cases are higher than 25m,” he added.

A force of 165 firefighters, with nine teams on foot, plus 30 vehicles, seven firefighting aircraft and five helicopters have been deployed to put out the flames.

The strong winds were greatly hampering the work of the firefighting aircraft participating in the operation, with the fight against the fire expected to last through the night as the winds were expected to continue to be very strong.

Medical centres and hospitals in Athens remained on alert on Sunday evening. Parts of the capital were left under a cloud of brown smoke.