13 people were arrested in Greece on Saturday after fireworks set off a forest fire on an island near Athens. This comes as the country prepares for another dangerous summer fire season.
The mayor of the island of Hydra was "outraged" when the fire started late on Friday and promised to take formal action against those who started it.
This week, dozens of flames in Greece killed at least one person.
Their Facebook page said the latest fire was "started by fireworks from a boat and burned the only pine forest on the island in a place that is hard to get to and does not have a road."
A statement from the fire service said that thirteen people were taken after an investigation into the fireworks. They will be brought before a judge on Sunday.
No specifics were given about the individuals. Greece has made the punishments for setting fires harsher. People who do this can get up to 20 years in jail and a fine of up to 200,000 euros (£169,000).
Hydra's mayor, Giorgos Koukoudakis, told the public station ERT that the people responsible for the fireworks should be charged with a crime and that the government needed to make more fire-safe zones and roads through woods.
According to the fire service, there was another fire on the island of Andros. Four towns were told to leave, and planes and helicopters were sent to put out the fires with water.
The civil protection service warned people to be careful because there was a "very high" risk of fires, especially in central Greece, the Peloponnese peninsula, and the Attica area.
Greece has been preparing for a rough summer because officials say high temperatures and strong winds have made things more dangerous.
The Mediterranean country experienced its first heat wave of the year last week, with temperatures reaching above 44C (111F) in some places. This came after its hottest winter ever.
Three days of strong winds have caused wildfires that killed at least one person on Friday. A 55-year-old man fell and died while fighting the flames around his town.
After a terrible heat wave that lasted two weeks, 20 people died in flames that destroyed homes and killed many more.
Scientists say that we are making heat waves last longer and stronger worldwide by burning fossil fuels.
A UN Intergovernmental Panel on Climate Change report says that rising temperatures are making wildfire seasons longer and burning more land.
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