Eleven countries are sending planes, helicopters and firefighters to southern Greece, where blazes have killed at least 49 people.
Many more are feared dead because some villages are sealed off by a wall of flames.
Most parts of the Peloponnese have been evacuated, and a three day period of mourning announced.
A 65-year-old man's been charged with arson and homicide, while two youths are also being questioned in another area.
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