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Brazilian firefighters on Monday battled flames blazing through a nature reserve in the capital district of Brasilia, where an area the size of 3,000 football fields has already been destroyed.

President Luiz Inacio Lula da Silva called an emergency meeting of his cabinet as Brazil's worst drought in seven decades has fueled fires in the Amazon rainforest and the Pantanal wetlands, choking major cities including Rio de Janeiro with smoke.

The capital Brasilia was the latest to be hit, battling its worst fire of the year as residents used buckets of water to dampen their threatened homes.

Three separate fires broke out over the weekend in the Brasilia National Park, officials said, razing about 1,200 hectares by Monday as dozens of firefighters with planes and helicopters battled to contain the onslaught.

"The flames began to come with great speed and at a height of about six meters (19 feet), and the community started to mobilize," nurse Simone Costa, 51, told AFP as she inspected fire damage with her husband and daughter near their home in Brasilia.

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