Migrants who survived say the boat was carrying 41 people when it set off for the Canaries in a particularly dangerous route due to strong currents.
The boat carrying the African migrants had been drifting for about a week in the Atlantic about 40 miles to the south of Gran Canaria, officials say.
The wildfire started in the town of Valleseco, and an emergency area was also declared for the municipalities of Moya and Tejeda.
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