New York City officials said on Wednesday they were working to address a rise in COVID-19 cases in parts of Brooklyn and Queens that was raising “a lot of concern.” Mayor Bill de Blasio said the new outbreaks, including a large cluster in three Brooklyn neighborhoods, accounted for about 20% of confirmed positive cases citywide. “We’re seeing a serious uptick in multiple neighborhoods simultaneously and it’s something we have to address with a very aggressive public health effort right away,” de Blasio told reporters, adding that the Sheriff’s Office and the New York Police Department would help tackle the spread.