Breaking News: Puerto Rico's government said 64 died from Hurricane Maria. A new study estimates thousands may have died, many from delayed medical care.

The researchers say their estimate, published Tuesday in the New England Journal of Medicine, remains imprecise, with more definitive studies still to come. But the findings, which used methods that have not been previously applied to this disaster, are important amid widespread concerns that the government’s tally of the dead, 64, was a dramatic undercount.

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