Greek authorities have declared a state of emergency on the island of Zakynthos, where wildfires are burning for a fourth day.

The fire service said the blazes are burning on 12 fronts and not threatening homes or resorts on the island, which is popular with tourists.

A man walks in front of huge blaze during a forest fire near the village of Varnava , north of Athens
(Petros Giannakouris/AP)

A statement from the office of Zakynthos mayor Pavlos Kolokotsas said there were “clear indications that fires were caused by an organised campaign of arson”.

Arson-related fires near populated areas in Greece are often associated with illegal development, especially near Athens and around holiday resorts.

Fire burns a forest land as a helicopter drops water in the village of Varnava , north of Athens
(Petros Giannakouris/AP)