Hurricane Maria killed more than 4,600 people in Puerto Rico

Hurricane Maria likely killed thousands of people across Puerto Rico last year, more than 70 times the official estimate, a Harvard study released Tuesday says. Authorities in Puerto Rico placed the death toll at 64 after Maria roared through the island Sept. 20, destroying buildings and knocking out power to virtually the entire U.S. territory of more than 3 million people.Researchers at the Harvard T.H. Chan School of Public Health, however, surveyed more than 3,000 households on the battered island. By extrapolating those findings, researchers determined that at least 4,645 "excess deaths" occurred during the storm and the weeks that followed.