Fires have destroyed Greece's largest migrant camp, an overcrowded facility on the island of Lesbos, leaving nearly 13,000 people without shelter.
Some 20 firefighters battled the blaze at the Moria camp - designed for fewer than 3,000 people - as migrants, many suffering from smoke exposure, fled.
Greece's migration minister said the fires "began with the asylum seekers", but did not elaborate.
Police blocked roads from the camp to prevent migrants entering nearby towns.
Many attempted to carry their belongings to the port town of Mytilene but access was cordoned off. Reports suggest many slept in fields after the fire.
EU home affairs commissioner Ylva Johansson has said she has agreed to finance the transfer of 400 unaccompanied teenagers and children to accommodation on the mainland.